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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-09-2 on page 216.
+%% 
+%%  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}
+\usepackage[utf8]{inputenc}
+\usepackage[english]{babel}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{24}
+\renewcommand\theequation{10.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,array}
+\AtBeginDocument{\setlength\tabcolsep{0pt}
+\renewcommand\arraystretch{0}
+\setlength\abovedisplayskip{0pt}
+\setlength\abovedisplayshortskip{0pt}
+\setlength\belowdisplayskip{0pt}
+\setlength\belowdisplayshortskip{0pt}}
+\newcommand*{\diff}{\mathop{}\!\mathrm{d}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{subequations}
+\begin{tabular}{@{}*{2}{m{0.5\linewidth}}@{}}
+\begin{align} \oint E \mathrm{d}s=0 \end{align}
+  & \begin{align} \nabla\times B=0 \label{sub:foo}\end{align}\\
+\begin{align} a =\frac{c}{d} \end{align}
+  & \begin{align} b = 1 \end{align}          \\
+\begin{align} c =1 \label{sub:baz}\end{align}
+  & \begin{align} \int 2x\diff x = x^2+C \end{align}
+\end{tabular}\par
+All subequations can be referenced in the usual way. For example,
+equations~\eqref{sub:foo} and~\eqref{sub:baz} are given correctly with their
+letters. The label has to be set correctly of course.
+\end{subequations}
+\end{document}