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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%% 
+%%  Beispiel 09-08-22 auf Seite 482.
+%% 
+%%  Copyright (C) 2012 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{166.324pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{84}
+\renewcommand\theequation{9.\arabic{equation}}
+
+\usepackage{amsmath,empheq,color}
+\newcommand*\diff{\mathop{}\!\mathrm{d}}
+
+\begin{document}
+\begin{subequations}
+\begin{align}
+  f(x) & =\int\limits_1^{\infty}\frac{1}{x^1}\diff t=1
+\end{align}
+\begin{empheq}[box={\fboxsep=10pt\colorbox{cyan}}]{align}
+  f(x) & =\int\limits_2^{\infty}\frac{1}{x^2}\diff t=0.25
+\end{empheq}
+\end{subequations}
+\end{document}