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%%  Example 01-09-1 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\[\begin{array}{rcl}
  a+b+c+d+ef & = & g+h+i+j+k \qquad
                  \parbox[t]{.25\linewidth}{this is a very long description of a formula}
\end{array}\]
\end{document}
