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+%%
+%% An UIT Edition example
+%%
+%% Example 09-16-6 on page 183.
+%%
+%% 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{gauss} \renewcommand\rowmultlabel[1]{|\,\times#1}
+\StopShownPreambleCommands
+\begin{document}
+\[\begin{gmatrix}
+ 1 &-2 & 1 & 2 & & 8 \\ 2 & 3 &-2 & 3 & & 14\\ % rows 0 and 1
+ 4 &-1 & 3 &-1 & & 7 \\ 3 & 2 &-4 & 5 & & 5 \\ % 2 and 3
+ \\
+ 1 &-2 & 1 & 2 & & 8 \\ 0 & 7 &-4 &-1 & &-2 \\ % 5 and 6
+ 0 & 7 &-1 &-9 & &-25\\ 0 & 8 &-7 &-1 & &-9 \\ % 7 and 8
+ \\
+ 1 &-2 & 1 & 2 & & 8 \\ 0 & 7 &-4 &-1 & &-2 \\ % 10 and 11
+ 0 & 0 & 3 &-8 & &-23\\ 0 & 0 &-17& 1 & &-47\\ % 12 and 13
+ \\
+ 1 &-2 & 1 & 2 & & 8 \\ 0 & 7 &-4 &-1 & &-2 \\ % 15 and 16
+ 0 & 0 & 3 &-8 & &-23\\ 0 & 0 & 0 &-\frac{133}{3}& &\frac{-532}{3} % 17 and 18
+\rowops
+\mult{0}{(-2)}\add{0}{1}\mult{0}{(-4)}\add{0}{2}\mult{0}{(-3)}\add{0}{3}% matrix 1
+\mult{6}{(-1)}\add{6}{7}\mult{6}{(-\frac{8}{7})}\add{6}{8}% matrix 2
+\mult{12}{\frac{17}{3}}\add{12}{13} % matrix 3
+\end{gmatrix} \]
+\end{document}