# How to make five equations per page?

I want to show 5 quadratic equations per page with equation number on the left side, how to do this?

\documentclass[preview,border=12pt]{standalone}
\usepackage{amsmath}
\begin{document}
\begin{gather}
-10 x^2+23 x-12=0 \\
56 x^2-28 x=0 \\
28 x^2+8 x-36=0 \\
-3 x^2+13 x-4=0 \\
-9 x^2+27 x-20=0 \\
-5 x^2+9 x-4=0 \\
2 x^2-12 x+16=0 \\
-14 x^2+48 x+32=0 \\
-45 x^2-36 x=0 \\
-45 x^2-66 x-24=0 \\
-14 x^2+40 x-24=0 \\
24 x^2+5 x-36=0 \\
9 x^2+38 x+8=0 \\
20 x-35 x^2=0 \\
-72 x^2-77 x-20=0 \\
-3 x^2+9 x+12=0 \\
-12 x^2-24 x=0 \\
-56 x^2-11 x+12=0 \\
28 x^2+20 x-8=0 \\
10 x^2+4 x-32=0 \\
-14 x^2-36 x-16=0 \\
-4 x^2-28 x+32=0 \\
5 x^2+29 x+36=0 \\
24 x^2-59 x+36=0 \\
-6 x^2-18 x+24=0 \\
-12 x^2-11 x+36=0 \\
-35 x^2-68 x-32=0 \\
-8 x^2-60 x-28=0 \\
64 x^2+16 x-24=0 \\
-21 x^2+19 x-4=0 \\
24 x^2+44 x+16=0 \\
15 x^2-5 x-20=0 \\
49 x^2+35 x+4=0 \\
4 x^2+12 x-16=0 \\
4 x^2-8 x-12=0 \\
8 x^2-37 x+20=0 \\
-10 x^2-37 x+36=0 \\
28 x^2+4 x-24=0 \\
-24 x^2+2 x+12=0 \\
6 x^2-15 x-36=0 \\
-36 x^2+24 x+12=0 \\
16 x^2+8 x-24=0 \\
-10 x^2-43 x-28=0 \\
-6 x^2-26 x+20=0 \\
12 x^2+16 x-16=0 \\
9 x^2+32 x-16=0 \\
4 x^2-4 x-8=0 \\
-24 x^2+60 x-36=0 \\
-5 x^2+21 x+20=0 \\
-5 x^2-x+4=0 \\
40 x^2+44 x-24=0 \\
3 x^2-10 x-8=0 \\
-42 x^2-17 x+4=0 \\
-15 x^2+32 x-16=0 \\
14 x^2+12 x-32=0 \\
20 x-25 x^2=0 \\
-30 x^2+4 x+16=0 \\
36 x^2-65 x-36=0 \\
9 x^2-12 x=0 \\
-2 x^2-13 x-20=0 \\
18 x^2+30 x-28=0 \\
-3 x^2+4 x+32=0 \\
56 x^2-25 x-4=0 \\
48 x^2+74 x+28=0 \\
-8 x^2-30 x+8=0 \\
3 x^2-10 x+8=0 \\
18 x^2-73 x-36=0 \\
-49 x^2+28 x+32=0 \\
-18 x^2+80 x-32=0 \\
-4 x^2+24 x-32=0 \\
18 x^2+x-4=0 \\
-4 x^2+12 x-8=0 \\
-35 x^2+36 x+32=0 \\
20 x^2+21 x+4=0 \\
20 x^2-68 x+24=0 \\
-16 x^2+28 x-12=0 \\
-24 x^2-52 x+32=0 \\
-18 x^2-30 x-12=0 \\
-18 x^2-28 x+16=0 \\
48 x^2+16 x-32=0 \\
-54 x^2-60 x-16=0 \\
28 x^2-64 x+36=0 \\
14 x^2+24 x-8=0 \\
40 x^2+28 x-24=0 \\
5 x^2-x-4=0 \\
27 x^2+48 x+16=0 \\
9 x^2+13 x+4=0 \\
-x^2+8 x-16=0 \\
6 x^2-14 x-12=0 \\
20 x-30 x^2=0 \\
27 x^2-84 x+32=0 \\
-32 x^2-8 x+12=0 \\
10 x^2+46 x+24=0 \\
-42 x^2+52 x-16=0 \\
-35 x^2+48 x-16=0 \\
9 x^2-41 x-20=0 \\
-24 x^2+8 x+16=0 \\
42 x^2-3 x-12=0 \\
45 x^2+47 x+12=0 \\
-32 x^2+24 x+20=0 \\
72 x^2+4 x-16=0 \\
-24 x^2+2 x+12=0 \\
-15 x^2-33 x+36=0 \\
5 x^2+23 x+12=0 \\
-18 x^2+3 x+36=0 \\
28 x^2+12 x-16=0 \\
10 x^2-2 x-36=0 \\
54 x^2+6 x-20=0 \\
2 x^2-14 x+20=0 \\
54 x^2-24=0 \\
10 x^2-16 x-8=0 \\
27 x^2+60 x+32=0 \\
-36 x^2-42 x-12=0 \\
-7 x^2-21 x+28=0 \\
-63 x^2-46 x-8=0 \\
10 x^2-14 x-12=0 \\
-32 x^2-32 x+24=0 \\
-27 x^2-30 x-8=0 \\
12 x^2-34 x+24=0 \\
-28 x^2-64 x-36=0 \\
49 x^2+28 x-32=0 \\
-24 x^2+60 x-36=0 \\
54 x^2-30 x-24=0 \\
-36 x^2+52 x-16=0 \\
9 x^2-44 x+32=0 \\
5 x^2-49 x+36=0 \\
28 x^2-30 x+8=0 \\
45 x^2-9 x-36=0 \\
-32 x^2+8 x+12=0 \\
20 x^2-31 x+12=0 \\
56 x^2-32 x=0 \\
18 x^2-54 x+28=0 \\
36 x^2-42 x+12=0 \\
10 x^2-18 x+8=0 \\
45 x^2+92 x+32=0 \\
12 x^2+22 x-20=0 \\
32 x^2+40 x+8=0 \\
-56 x^2-60 x-16=0 \\
12 x^2+46 x-36=0 \\
-45 x^2-71 x-28=0 \\
-42 x^2-10 x+12=0 \\
-8 x^2+20 x+12=0 \\
-49 x^2+14 x+24=0 \\
-2 x^2+11 x-12=0 \\
-18 x^2+6 x+24=0 \\
-40 x^2-60 x-20=0 \\
36 x^2+12 x-24=0 \\
-x^2-13 x-36=0 \\
36 x^2+24 x-12=0 \\
36 x-63 x^2=0 \\
6 x^2+22 x+20=0 \\
10 x^2-4 x-32=0 \\
-8 x^2+16 x-8=0 \\
24 x^2+5 x-36=0 \\
-24 x^2+26 x+8=0 \\
-6 x^2+29 x-20=0 \\
-48 x^2+8 x+8=0 \\
-24 x^2-20 x-4=0 \\
45 x^2-31 x-4=0 \\
-27 x^2+27 x+12=0 \\
-12 x^2+2 x+24=0 \\
-72 x^2+104 x-32=0 \\
14 x^2+44 x+32=0 \\
36 x^2-54 x+20=0 \\
-16 x^2-32 x-12=0 \\
-56 x^2-20 x+4=0 \\
64 x^2-64 x+16=0 \\
-60 x^2+46 x+28=0 \\
8 x^2-6 x-20=0 \\
36 x^2+16 x-20=0 \\
12-12 x^2=0 \\
-27 x^2-48 x-16=0 \\
-28 x^2+23 x-4=0 \\
-6 x^2-20 x+16=0 \\
25 x^2-25 x+4=0 \\
36 x^2+20 x-16=0 \\
4 x^2-8 x-32=0 \\
-8 x^2-34 x-36=0 \\
28 x^2-9 x-4=0 \\
24 x^2+32 x=0 \\
27 x^2+60 x+32=0 \\
-18 x^2-42 x+36=0 \\
-12 x^2-48 x-36=0 \\
-40 x^2+28 x+12=0 \\
-4 x^2-9 x+28=0 \\
63 x^2-8 x-16=0 \\
-6 x^2+16 x+32=0 \\
20 x^2-41 x+20=0 \\
12 x^2+44 x+24=0 \\
30 x^2-74 x+36=0 \\
-36 x^2+8 x+28=0 \\
-21 x^2-49 x-28=0 \\
-45 x^2-101 x-36=0 \\
-3 x^2+14 x-8=0 \\
-28 x^2+4 x+32=0 \\
-28 x^2+24 x+4=0 \\
15 x^2-41 x+28=0 \\
15 x^2+14 x-8=0 \\
-24 x^2-44 x-16=0 \\
30 x^2+14 x-8=0 \\
35 x^2-x-12=0 \\
48 x^2+32 x+4=0 \\
9 x^2-36 x=0 \\
9 x^2-6 x-24=0 \\
9 x^2+5 x-4=0 \\
56 x^2+18 x-8=0 \\
18 x^2-54 x+36=0 \\
36 x-63 x^2=0 \\
64 x^2+40 x+4=0 \\
-18 x^2-50 x-28=0 \\
48 x^2+44 x+8=0 \\
-8 x^2-36 x-28=0 \\
45 x^2-16 x-16=0 \\
-x^2-x+12=0 \\
18 x^2+62 x+24=0 \\
-56 x^2+95 x-36=0 \\
30 x^2+34 x-36=0 \\
48 x^2-44 x+8=0 \\
-20 x^2-24 x-4=0 \\
-30 x^2-16 x+32=0 \\
16 x^2-16=0 \\
21 x^2-54 x+24=0 \\
16 x^2+20 x-24=0 \\
81 x^2-36 x-32=0 \\
36 x^2+78 x+36=0 \\
-30 x^2+14 x+4=0 \\
5 x^2-4 x=0 \\
-2 x^2-2 x+24=0 \\
-12 x^2+10 x+8=0 \\
-8 x^2-76 x-36=0 \\
-18 x^2+30 x+12=0 \\
-6 x^2-16 x+32=0 \\
64 x^2+8 x-20=0 \\
27 x^2-12 x=0 \\
-42 x^2-28 x=0 \\
-35 x^2-43 x-12=0 \\
32 x^2+24 x+4=0 \\
18 x^2-9 x-20=0 \\
-6 x^2+30 x-24=0 \\
8 x^2+52 x+24=0 \\
18 x^2+48 x+24=0 \\
8 x^2-24 x-32=0 \\
18 x^2+55 x-28=0 \\
-45 x^2+66 x-24=0 \\
-15 x^2-2 x+8=0 \\
-14 x^2+57 x-28=0 \\
-6 x^2+4 x+32=0 \\
-36 x^2-18 x+28=0 \\
-24 x^2-60 x+36=0 \\
-72 x^2-95 x-28=0 \\
-40 x^2+36 x+28=0 \\
3 x^2+2 x-8=0 \\
8 x^2+68 x-36=0 \\
12-48 x^2=0 \\
-49 x^2-70 x-24=0 \\
-54 x^2+30 x+4=0 \\
-15 x^2-20 x=0 \\
-24 x^2-60 x-24=0 \\
-24 x^2-4 x+8=0 \\
-16 x^2+64 x+36=0 \\
28 x^2+16 x=0 \\
72 x^2+108 x+36=0 \\
8 x^2+28 x+12=0 \\
-9 x^2-27 x-20=0 \\
-21 x^2-26 x-8=0 \\
-54 x^2+69 x-20=0 \\
-30 x^2+10 x+20=0 \\
14 x^2-30 x+4=0 \\
2 x^2+x-28=0 \\
12 x^2-43 x+36=0 \\
3 x^2-4 x=0 \\
48 x^2-32 x-28=0 \\
-35 x^2+36 x+32=0 \\
-4 x^2+14 x+8=0 \\
30 x^2+14 x-4=0 \\
54 x^2-78 x+28=0 \\
-7 x^2+24 x+16=0 \\
-6 x^2+16 x+32=0 \\
36 x^2-8 x-28=0 \\
16 x^2+24 x+8=0 \\
14 x^2+28 x=0 \\
-8 x^2-8 x=0 \\
-8 x^2+37 x-20=0 \\
-63 x^2+85 x-28=0 \\
18 x^2-18 x-20=0 \\
27 x^2-75 x+28=0 \\
32 x-72 x^2=0 \\
-5 x^2-14 x+24=0 \\
-6 x^2+52 x-32=0 \\
-15 x^2-18 x+24=0 \\
7 x^2+21 x-28=0 \\
-24 x^2-20 x-4=0 \\
30 x^2-6 x-24=0 \\
8 x^2-12 x-20=0 \\
-4 x^2+40 x-36=0 \\
-35 x^2-36 x+32=0 \\
8 x^2+28 x+20=0 \\
6 x^2+28 x+32=0 \\
30 x^2+2 x-12=0 \\
25 x^2-20 x=0
\end{gather}
\end{document}


Here is a proposal using spreadlines from mathtools as well as align for better alignment of the equations. You need to use the command \allowdisplaybreaks in order for the equations to be broken over pages.

The spacing between the lines is set to \textheight/5-\baselineskip. So the height of the text divided by 5, minus the height of one line.

To get the equation numbers on the left hand side, use the option leqno.

UPDATE: Because the document begins with an equation, there is some added vertical space before the equation begins (see How to place amsmath equations at top of page ignoring \topskip?). But adding \noindent at the start of the document solves this.

\documentclass[a4paper]{article}
\usepackage[margin=2cm,showframe]{geometry}

\allowdisplaybreaks

\begin{document}
\noindent
\begin{align}
-10 x^2+23 x-12=0 \\
56 x^2-28 x=0 \\
28 x^2+8 x-36=0 \\
-3 x^2+13 x-4=0 \\
-9 x^2+27 x-20=0 \\
-5 x^2+9 x-4=0 \\
2 x^2-12 x+16=0 \\
-14 x^2+48 x+32=0 \\
-45 x^2-36 x=0 \\
-45 x^2-66 x-24=0 \\
-14 x^2+40 x-24=0 \\
24 x^2+5 x-36=0 \\
9 x^2+38 x+8=0 \\
20 x-35 x^2=0 \\
-72 x^2-77 x-20=0 \\
-3 x^2+9 x+12=0 \\
-12 x^2-24 x=0 \\
-56 x^2-11 x+12=0 \\
28 x^2+20 x-8=0 \\
10 x^2+4 x-32=0 \\
-14 x^2-36 x-16=0 \\
-4 x^2-28 x+32=0 \\
5 x^2+29 x+36=0 \\
24 x^2-59 x+36=0 \\
-6 x^2-18 x+24=0 \\
-12 x^2-11 x+36=0 \\
-35 x^2-68 x-32=0 \\
-8 x^2-60 x-28=0 \\
64 x^2+16 x-24=0 \\
-21 x^2+19 x-4=0 \\
24 x^2+44 x+16=0 \\
15 x^2-5 x-20=0 \\
49 x^2+35 x+4=0 \\
4 x^2+12 x-16=0 \\
4 x^2-8 x-12=0 \\
8 x^2-37 x+20=0 \\
-10 x^2-37 x+36=0 \\
28 x^2+4 x-24=0 \\
-24 x^2+2 x+12=0 \\
6 x^2-15 x-36=0 \\
-36 x^2+24 x+12=0 \\
16 x^2+8 x-24=0 \\
-10 x^2-43 x-28=0 \\
-6 x^2-26 x+20=0 \\
12 x^2+16 x-16=0 \\
9 x^2+32 x-16=0 \\
4 x^2-4 x-8=0 \\
-24 x^2+60 x-36=0 \\
-5 x^2+21 x+20=0 \\
-5 x^2-x+4=0 \\
40 x^2+44 x-24=0 \\
3 x^2-10 x-8=0 \\
-42 x^2-17 x+4=0 \\
-15 x^2+32 x-16=0 \\
14 x^2+12 x-32=0 \\
20 x-25 x^2=0 \\
-30 x^2+4 x+16=0 \\
36 x^2-65 x-36=0 \\
9 x^2-12 x=0 \\
-2 x^2-13 x-20=0 \\
18 x^2+30 x-28=0 \\
-3 x^2+4 x+32=0 \\
56 x^2-25 x-4=0 \\
48 x^2+74 x+28=0 \\
-8 x^2-30 x+8=0 \\
3 x^2-10 x+8=0 \\
18 x^2-73 x-36=0 \\
-49 x^2+28 x+32=0 \\
-18 x^2+80 x-32=0 \\
-4 x^2+24 x-32=0 \\
18 x^2+x-4=0 \\
-4 x^2+12 x-8=0 \\
-35 x^2+36 x+32=0 \\
20 x^2+21 x+4=0 \\
20 x^2-68 x+24=0 \\
-16 x^2+28 x-12=0 \\
-24 x^2-52 x+32=0 \\
-18 x^2-30 x-12=0 \\
-18 x^2-28 x+16=0 \\
48 x^2+16 x-32=0 \\
-54 x^2-60 x-16=0 \\
28 x^2-64 x+36=0 \\
14 x^2+24 x-8=0 \\
40 x^2+28 x-24=0 \\
5 x^2-x-4=0 \\
27 x^2+48 x+16=0 \\
9 x^2+13 x+4=0 \\
-x^2+8 x-16=0 \\
6 x^2-14 x-12=0 \\
20 x-30 x^2=0 \\
27 x^2-84 x+32=0 \\
-32 x^2-8 x+12=0 \\
10 x^2+46 x+24=0 \\
-42 x^2+52 x-16=0 \\
-35 x^2+48 x-16=0 \\
9 x^2-41 x-20=0 \\
-24 x^2+8 x+16=0 \\
42 x^2-3 x-12=0 \\
45 x^2+47 x+12=0 \\
-32 x^2+24 x+20=0
\end{align}

• Thank you. I use \usepackage[a6paper,top=5mm,bottom=15mm,hmargin=1cm]{geometry} and I get 21 pages. How to make it 20 pages? – Field Medalist Jul 28 '18 at 2:03
• I just updated the answer, you need to set the spacing to \textheight/5-\baselineskip – Milo Jul 28 '18 at 2:05
• Use \noindent. I've updated the MWE in my answer post. – Milo Jul 28 '18 at 9:25