Okay, so I have the following derivation so far in my latex document:
\documentclass[a4paper,oneside,11pt]{report}
\usepackage[english]{babel} %francais, polish, spanish, ...
\usepackage[T1]{fontenc}
\usepackage[ansinew]{inputenc}
\usepackage[cm]{fullpage}
\usepackage{float}
\usepackage{lmodern}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{a4wide}
\setlength{\marginparwidth}{3cm}
\setlength{\topmargin}{0cm}
\setlength{\voffset}{0cm}
\setlength{\headsep}{0cm}
\usepackage{etoolbox}
\makeatletter
\patchcmd{\chapter}{\if@openright\cleardoublepage\else\clearpage\fi}{}{}{}
\makeatother
\makeatletter
\def\@makechapterhead#1{%
\vspace*{10\p@}%
{\parindent \z@ \raggedright \normalfont
%\ifnum \c@secnumdepth >\m@ne
% \huge\bfseries \@chapapp\space \thechapter
% \par\nobreak
% \vskip 20\p@
%\fi
\interlinepenalty\@M
\Huge \thechapter \space \space \space \bfseries #1\par\nobreak
\vskip 10\p@
}}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% DOCUMENT
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\begin{align}
F_{x_t}(h-h_3) + (F_{z_t} + mgcos\phi - 2F_{z_1})a_2 - 2h(F_{x_1} + F_{x_2}) - 2F_{z_1}a_1 - F_{z_t}(a_2 + b_1) = 0 \nonumber
\end{align}
\begin{align}
2F_{z_1}(a_1 + a_2) &= F_{x_t}(h - h_3) + (F_{z_t} + mgcos\phi)a_2 -2h(F_{x_1} + F_{x_2}) - F_{z_t}(a_2 + b_1) \nonumber \\
&= A_2sin\phi(h - h_3) + mga_2cos\phi - 2hA_1sin\phi - b_1(A_3sin\phi + B_3cos\phi) \nonumber \\
&= sin\phi\big(A_2(h - h_3) -2hA_1 -b_1A_3 \big) + cos\phi \big(mga_2 - b_1B_3 \big) \nonumber
\end{align}
\begin{align}
\therefore F_{z_1} = A_4sin\phi + B_4cos\phi
\end{align}
\end{document}
As you can see, there are 5 lines in the derivation (i.e between \begin{align}
and \end{align}
statements. However, the middle 3 need to be aligned w.r.t to the equals sign, and the top and bottom line should be centred. I've sort of managed to achieve it this way, but I want a way of doing it without 3 align blocks, is this possible?
a4wide
package is deprecated. Usegeometry
for setting the page parameters.