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+%%
+%% An UIT Edition example
+%%
+%% Example 06-11-8 on page 107.
+%%
+%% 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{201.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{58}
+\renewcommand\theequation{6.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{subequations}
+\renewcommand{\theequation}{%
+ \theparentequation -\arabic{equation}}
+\begin{align}
+y &= d\\
+y &= cx+d\label{eq:subequation}\\
+y &= bx^{2}+cx+d\\
+y &= ax^{3}+bx^{2}+cx+d
+\end{align}
+\end{subequations}
+A reference to Eq.~\ref{eq:subequation}
+on page~\pageref{eq:subequation}.
+\end{document}