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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 09-17-8 on page 190.
+%% 
+%%  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}}
+\setcounter{equation}{25}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{mathtools}
+\StopShownPreambleCommands
+\begin{document}
+\begin{gather}
+\begin{lgathered}
+ i_{11}+i_{21}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\ i_{31}=0.33i_{22}+i_{11}-0.1i_{21}
+\end{lgathered}\\[5pt]
+\begin{rgathered}
+ i_{11}+i_{21}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\ i_{31}=0.33i_{22}+i_{11}-0.1i_{21}
+\end{rgathered}\\[5pt]
+\begin{gathered}
+ i_{11}+i_{21}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\ i_{31}=0.33i_{22}+i_{11}-0.1i_{21}
+\end{gathered}
+\end{gather}
+\end{document}