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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}
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