\documentclass{article}
\usepackage{comment}

\begin{document}

\begin{comment}
Test accents \v! and \v@ here.

Line with inline verbatim: \verb+verb+
Line with inline verbatim: \verb*+verb+

Line with $inline math$ here.\footnote{here {asd} with \cmd also}.
\end{comment}

\begin{comment}
  text text text text text text text text text text text text text 
  \begin{equation}
    a=b
  \end{equation}
  text text text text text text text text text text text text text 
  \begin{empheq}[box=\widefbox]{align*}
    c_1 &= a\\
    c_2 &= b\\
    c_3 &= c
  \end{empheq}
  text text text text text text text text text text text text text 
\end{comment}

\end{document}