How to write crossed-out math in LaTeX?

Source: https://tex.stackexchange.com/questions/75525/how-to-write-crossed-out-math-in-latex

 

The comments above should have solved the problem. But I thought a minimal example will go a long way:

\documentclass{article}
\usepackage{amsmath}
\usepackage[makeroom]{cancel}

\begin{document}
\noindent
\verb|\cancel{5y}|:
\[ x+\cancel{5y}=0\]
\verb|\bcancel{5y}|:
\[ x+\bcancel{5y}=0\]
\verb|\xcancel{5y}|:
\[ x+\xcancel{5y}=0\]
\verb|\cancelto{\infty}{5y}|:
\[ x+\cancelto{\infty}{5y}=0\]

The first three commands work in text mode also i.e., \cancel{5y}, \bcancel{5y} and 
\xcancel{5y} works but \verb|\cancelto{\infty}{5y}| is not. 
\end{document}

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