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+%%
+%% An UIT Edition example
+%%
+%% Example 10-10-1 on page 222.
+%%
+%% Copyright (C) 2010 Herbert Voss
+%%
+%% 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.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{153.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin {align*}
+ 4x+ 6y -2z &= -4\\
+ x -y +2z &= 9 \\[-1.4 ex]%
+ \cline{1-2}
+ 5x + 5y &= 5 \\
+ x + y &= 1 \\[-1.4 ex]%
+\multispan{2}{%
+ \leaders\hbox{$\mkern-2mu\Relbar\mkern-2mu$}\hfil}\\
+ y &= 1-x
+\end {align*}
+\end{document}