%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 10-09-2 auf Seite 229.
%%  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.
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\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\usepackage[utf8]{inputenc}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{18}
\renewcommand\theequation{10.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath,array} \newcommand*\diff{\mathop{}\!\mathrm{d}}
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%StopShownPreambleCommands
\begin{document}
\begin{tabular}{@{}*{2}{m{0.5\linewidth}}@{}}
\begin{align}\oint E\diff s=0 \end{align}
  & \begin{align}\nabla\cdot B=0\end{align}\\[-5pt]
\begin{align} a =\frac{c}{d} \end{align}
  & \begin{align} b = 1 \end{align}        \\[-5pt]
\begin{align} c =1 \end{align} & \begin{align}\int 2x\diff x = x^2+C\end{align}
\end{tabular}
\end{document}