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%% 
%%  An UIT Edition example
%% 
%%  Example 03-04-6 on page 25.
%% 
%%  Copyright (C) 2010 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[]{exareport}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}
\setcounter{equation}{19}
\renewcommand\theequation{3.\arabic{equation}}\setlength\parskip{1ex plus 0.2ex}

\StartShownPreambleCommands
\documentclass{article}
\makeatletter
\newcommand*\Left{\begingroup\renewcommand\@eqnnum{\hb@xt@.01\p@{}%
  \rlap{\normalfont\normalcolor\hskip-\displaywidth(\theequation)}}}
\makeatother
\StopShownPreambleCommands
\begin{document}
Normal text in a line, which does not have any additional meaning.
%
\begin{equation} f(x)=x^2 +x-1           \end{equation}\Left
\begin{equation} g(x)=\frac{x^2}{x+1}    \end{equation}
\[      g^{\prime}(x)=\frac{2x(x+1)-x^2}{(x+1)^2}  \] \endgroup
\begin{equation} h(x)=\mathrm{cosh}(x-1) \end{equation}
%
Normal text in a line, which does not have any additional meaning.
\end{document}