%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 09-10-1 auf Seite 181.
%%  Copyright (C) 2018 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[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{122.40707pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{amsmath,color,cancel}
\newcommand\hcancel[2][black]{%
  \setbox0=\hbox{#2}\rlap{\raisebox{.45\ht0}{%
      \textcolor{#1}{\rule{\wd0}{1pt}}}}#2}
%StopShownPreambleCommands
\begin{document}
$\cancel{3}\qquad f(x)=\dfrac{\left(x^2+1\right)
    \cancel{(x-1)}}{\cancel{(x-1)}(x+1)}$\\[0.5cm]
$\bcancel{3}\qquad\bcancel{1234567}$\\[0.5cm]
\renewcommand*{\CancelColor}{\color{cyan}}
$\xcancel{3}\qquad\xcancel{1234567}$\\[0.5cm]
$\hcancel{3}\qquad\hcancel[red]{1234567}$
\end{document}