equation with canceled terms

Question

How to write this equation please

xs'e^x + xse^x + s^2e^{2x} − xse^x = e^{2x},

Answer 1

\documentclass{article}

\usepackage{cancel}

\begin{document}

\[
xs'e^x + \cancel{xse^x} + s^2e^{2x} − \cancel{xse^x} = e^{2x},
\]
\end{document}

Answer 2

When you load the cancel package as suggested by Christian, you do the following:

xs'e^{x} + \cancel{cse^{x}} + s^2 e^{2x} - \cancel{xse^{x}} = e^{2x}

Notice the \cancel{} command.