%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 4-6-2 on page 48.
%% 
%%  Copyright (C) 2009 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.
%% 

\documentclass[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{355.65944pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{17}
\renewcommand\theequation{4.\arabic{equation}}
\usepackage[ngerman]{babel}
\StartShownPreambleCommands
\usepackage{ragged2e}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
a+b+c+d+ef = g+h+i+j+k\qquad\textrm{\parbox[t]{.3\linewidth}{\RaggedRight%
  Dies ist eine sehr lange Beschreibung einer Formel}}
\end{equation}
\end{document}