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%%
%% Ein Beispiel der DANTE-Edition
%%
%% 2. Auflage
%%
%% Beispiel 09-07-47 auf Seite 438.
%%
%% Copyright (C) 2016 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}{64}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath} \newcounter{mySubCounter}
\newcommand\twocoleqn[2]{\setcounter{mySubCounter}{0}\let\OldTheEquation\theequation
\renewcommand\theequation{\OldTheEquation\alph{mySubCounter}}%
\noindent\begin{minipage}{.49\textwidth}
\begin{align}\refstepcounter{mySubCounter}#1\end{align}
\end{minipage}\hfill\addtocounter{equation}{-1}%
\begin{minipage}{.49\textwidth}
\begin{align}\refstepcounter{mySubCounter}#2\end{align}
\end{minipage}\let\theequation\OldTheEquation}
%StopShownPreambleCommands
\begin{document}
\twocoleqn{y=f(x)}{y=f(z)}
\begin{align} z &= f(x,y) \end{align}
\end{document}
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