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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}