27

What is the way to achieve something between gather and aligned?

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[utf8]{inputenc}

\begin{document}
\begin{gather}
    3(a-x) = 3.5x + a - 1 \\
    3a - 3x = 3.5x + a -1 \\
    a = \frac{13}{4}x - \frac{1}{2} 
\end{gather}

\begin{equation}
    \begin{aligned}
        3(a-x) = 3.5x + a - 1           \\
        3a - 3x = 3.5x + a -1           \\
        a = \frac{13}{4}x - \frac{1}{2} 
    \end{aligned}
\end{equation}
\end{document}

Result:

enter image description here

But... How to achieve something like this? I'd like to keep the centering. enter image description here

Is this possible somehow?

26

The gathered environment, used within math mode, is what you're looking for.

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[utf8]{inputenc}
\begin{document}
\begin{equation}
\begin{gathered}
3(a-x) = 3.5x + a - 1 \\
3a - 3x = 3.5x + a - 1 \\
a = \frac{13}{4}x - \frac{1}{2}
\end{gathered}
\end{equation}
\end{document}

output

Wikibooks LaTeX has a fairly nice list of the different kinds of equation and align environments.

|improve this answer|||||
  • 1
    This works great, but the numbering is put at the bottom if the equation is too big. Is there a way to force the number to be on the center (right)? – Guilherme Salomé Jun 21 '18 at 15:07

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