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+%%
+%% An UIT Edition example
+%%
+%% Example 06-11-9 on page 108.
+%%
+%% Copyright (C) 2010 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{59}
+\renewcommand\theequation{6.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath} \newcounter{mySubCounter}
+\newcommand\twocoleqn[2]{\setcounter{mySubCounter}{0}\let\OldTheEq\theequation%
+ \renewcommand\theequation{\OldTheEq\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\OldTheEq}
+\StopShownPreambleCommands
+\begin{document}
+\twocoleqn{y=f(x)}{y=f(z)}
+\begin{align} z &= f(x,y) \end{align}
+\end{document}