%%
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 09-19-11 auf Seite 198.
%%  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
%%
%%
\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{mathtools} \newcommand*\CMD[1]{\texttt{\textbackslash#1}}
%StopShownPreambleCommands
\begin{document}
\[ \begin{multlined}[c][0.75\linewidth]
    \framebox[0.5\columnwidth]{x}\\ \framebox[0.5\columnwidth]{x}\\
    \shoveleft{\framebox[0.5\columnwidth]{\CMD{shoveleft}}}\\
    \shoveright{\framebox[0.5\columnwidth]{\CMD{shoveright}}}\\
    \framebox[0.5\columnwidth]{x}\\ \framebox[0.5\columnwidth]{x}
  \end{multlined} \]
\[ \begin{multlined}[c][0.75\linewidth]
    \framebox[0.5\columnwidth]{x}\\ \framebox[0.5\columnwidth]{x}\\
    \shoveleft[1cm]{\framebox[0.5\columnwidth]{\CMD{shoveleft}}}\\
    \shoveright[-5mm]{\framebox[0.5\columnwidth]{\CMD{shoveright}}}\\
    \framebox[0.5\columnwidth]{x}\\ \framebox[0.5\columnwidth]{x}
  \end{multlined} \]
\end{document}