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+%%
+%% An UIT Edition example
+%%
+%% Example 09-12-1 on page 177.
+%%
+%% 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}{5}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,empheq,xcolor,graphicx}
+\newcommand*\mycolbox[1]{%
+ \colorbox{blue!30!yellow!40}{\hspace{1em}#1\hspace{1em}}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{subequations}
+\begin{empheq}[% start of options
+ box=\mycolbox,
+ right={\;\makebox[.9em]{$\raisebox{-.5\totalheight+\fontdimen22\textfont2}
+ {\resizebox{!}{\EmphEqdisplayheight+\EmphEqdisplaydepth}{!}}$}},
+ left={X=Y\Rightarrow\empheqlbrace}]{alignat=3}
+%
+ A_1&=b_1 & \qquad c_1&=d_1 & \qquad e_1&= f_1
+ \tag*{\_A\raisebox{1ex}{silly}\raisebox{-1ex}{tag}\_}\\
+ A_2&=b_2 & \qquad c_2&=d_2 & \qquad e_2&= f_2 \\
+ A_3&=b_3 & \qquad c_3&=d_3 & \qquad e_3&= f_3
+\end{empheq}
+\end{subequations}
+\end{document}