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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 2. Auflage
+%%
+%% Beispiel 09-12-5 auf Seite 188.
+%%
+%% Copyright (C) 2012 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{352.81416pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{10}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{empheq}
+\StopShownPreambleCommands
+\begin{document}
+\begin{empheq}[right=\kern1em\empheqrbrace\quad\Leftarrow\text{subtrahieren}]{align}
+ 3x_1 + 4x_2 -3x_3 &= 4\\ 3x_1 - 4x_2 - x_3 &= 1
+\end{empheq}
+\end{document}