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%% 
%%  An UIT Edition example
%% 
%%  Example 05-03-5 on page 75.
%% 
%%  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}
\setlength\parindent{0pt}
\setcounter{equation}{2}
\renewcommand\theequation{5.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{xcolor,framed,amsmath,esint}
\newcommand*\Q[2]{\frac{\partial #1}{\partial #2}}
\definecolor{shadecolor}{cmyk}{0.2,0.1,0.9,0.1}
\StopShownPreambleCommands
\begin{document}
\begin{shaded}
\begin{align}
\underset{\mathcal{G}\quad}\iiint\!%
        \left[u\nabla^{2}v+\left(\nabla u,\nabla v\right)\right]\mathrm{d}^{3}V%
        =\underset{\mathcal{S}\quad}\oiint u\Q{v}{n}\mathrm{d}^{2}A
\end{align}
\begin{align}
\underset{{\mathcal{G}\quad}}\iiint\!%
        \left[u\nabla^{2}v-v\nabla^{2}u\right]\mathrm{d}^{3}V%
        =\underset{\mathcal{S}\quad}\oiint%
        \left(u\Q{v}{n}-v\Q{u}{n}\right)\mathrm{d}^{2}A
\end{align}
\end{shaded}
\end{document}