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%%
%% Ein Beispiel der DANTE-Edition
%%
%% 1. Auflage
%%
%% Beispiel 09-08-41 auf Seite 491.
%%
%% Copyright (C) 2011 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{190.324pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{99}
\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}
\end{agathered}
\end{align}
\end{document}
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