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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 2. Auflage
+%%
+%% Beispiel 09-17-9 auf Seite 201.
+%%
+%% 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}{28}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{mathtools}
+\newcounter{linecnt}\renewcommand\thelinecnt{(\alph{linecnt})}
+\newcommand\stepline{\stepcounter{linecnt}\thelinecnt}
+\newgathered{agathered}{\llap{\stepline}\quad\hfil}{\hfil}{\setcounter{linecnt}{0}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+\begin{agathered}
+ i_{11}+i_{21}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\ i_{31}=0.33i_{22}+i_{11}-0.1i_{21}
+\end{agathered}\\[7pt]
+\begin{agathered}
+ f(x)=3x+4\\ g(x)=\sqrt{x^2-1}\\ h(x)=\frac{1}{x}
+\end{agathered}
+\end{align}
+\end{document}