Align – How to Right Align an Equation in LaTeX

Question

I have an equation and i want to right align it:

\documentclass{report}
\usepackage{amsmath,amsfonts,amsthm,bm} %math

%----------------------------------------
%Align Equations to LEFT MARGIN (use \mathleft then \mathcenter)
\makeatletter
\newcommand{\mathleft}{\@fleqntrue\@mathmargin0pt}
\newcommand{\mathcenter}{\@fleqnfalse}
\makeatother
%----------------------------------------

\begin{document}
\begin{align}
center
\end{align}
\mathleft
\begin{align}
left
\end{align}
\end{document}

I have an awesome piece of code that allows me to leftalign with \mathleft, is it possible to have one that right align?

Answer 1

Of course you can, though not without reading the TeXbook (Exercise 19.8). Look at the final example, though, which could be what you're looking for.

\documentclass{article}
\usepackage{amsmath}

\usepackage{lipsum}

\begin{document}

\lipsum*[2]
\begin{equation}
\hfilneg \text{left} \hspace{10000pt minus 1fil}
\end{equation}
\lipsum*[2]
\begin{equation}
\text{center}
\end{equation}
\lipsum*[4]
\begin{equation}
\hspace{10000pt minus 1fil} \text{right} \hfilneg
\end{equation}
But I guess you want something like this final example,
because ``right aligning'' equations has generally no
use:
\begin{multline}
\text{the first part of a very long equation,
      that is set flush left} \\
\text{the final part, also quite long, set flush right}
\end{multline}

\end{document}