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%%  Example 01-04-1 
%%  Copyright (C) 2017 Herbert Voss
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{304.62788pt}
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\begin{document}
\begin{equation}
\left.
\begin{array}{@{}r@{\quad}ccrr@{}}
  \textrm{a}) & y & = & c & (\textit{constant})\\
  \textrm{b}) & y & = & cx+d & (\textit{linear})\\
  \textrm{c}) & y & = & bx^{2}+cx+d & (\textit{square})\\
  \textrm{d}) & y & = & ax^{3}+bx^{2}+cx+d & (\textit{cubic})
\end{array}
   \mkern18mu\right\} 	\textrm{Polynomes}
\end{equation}
\end{document}
