%% 
%%  Example 01-22-2 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{134.31393pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
{\mathversion{bold}%  inside a group
\begin{equation}
y(x) = ax^3+bx^2+cx+d
\end{equation}
$y=f(x)$ } $y=f(x)$
\end{document}
