%%
%% Ein Beispiel der DANTE-Edition
%% Mathematiksatz mit LaTeX
%% 3. Auflage
%% Beispiel 09-14-4 auf Seite 185.
%% Copyright (C) 2018 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
%%
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\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{146.40707pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{9}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath,empheq,color}
\newcommand*\diff{\mathop{}\!\mathrm{d}}
%StopShownPreambleCommands
\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}
