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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}