<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%% 
%%  An UIT Edition example
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%%  Example 03-02-9 on page 20.
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%%  Copyright (C) 2010 Herbert Voss
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%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
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%%  See http://www.latex-project.org/lppl.txt for details.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\setlength\parindent{0pt}
\setcounter{equation}{9}
\renewcommand\theequation{3.\arabic{equation}}
\StartShownPreambleCommands

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\begin{document}
\begin{eqnarray*}
  y &amp; = &amp; d   \label{eq:3}\\
  y &amp; = &amp; cx+d            \\
  y &amp; = &amp; bx^{2}+cx+d     \\
  y &amp; = &amp; ax^{3}+bx^{2}+cx+d
\end{eqnarray*}
As Equation~\ref{eq:3} shows \ldots
\begin{eqnarray}
  y &amp; = &amp; x^4
\end{eqnarray}
\end{document}
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