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%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 8-2-16 on page 477.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%% Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
\documentclass{ttctexamargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\renewcommand\minalignsep{2em}
\begin{align}
x &= y && \text{by hypothesis} \\
x' &= y' && \text{by definition} \\
x + x' &= y + y' && \text{by Axiom 1}
\end{align}
\end{document}
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