\begin{Verbatim}[commandchars=\\\{\}]
\PYG{k}{\PYGZbs{}newenvironment}\PYG{n+nb}{\PYGZob{}}gauss\PYG{n+nb}{\PYGZcb{}}[1]\PYG{n+nb}{\PYGZob{}}
    \PYG{k}{\PYGZbs{}left}(\PYG{k}{\PYGZbs{}begin}\PYG{n+nb}{\PYGZob{}}array\PYG{n+nb}{\PYGZcb{}\PYGZob{}}*\PYG{n+nb}{\PYGZob{}}\PYGZsh{}1\PYG{n+nb}{\PYGZcb{}\PYGZob{}}c\PYG{n+nb}{\PYGZcb{}}|c\PYG{n+nb}{\PYGZcb{}}
\PYG{n+nb}{\PYGZcb{}\PYGZob{}}
    \PYG{k}{\PYGZbs{}end}\PYG{n+nb}{\PYGZob{}}array\PYG{n+nb}{\PYGZcb{}}\PYG{k}{\PYGZbs{}right})
\PYG{n+nb}{\PYGZcb{}}

\PYG{k}{\PYGZbs{}begin}\PYG{n+nb}{\PYGZob{}}document\PYG{n+nb}{\PYGZcb{}}
    We krijgen nu de matrix
    \PYG{k}{\PYGZbs{}begin}\PYG{n+nb}{\PYGZob{}}align*\PYG{n+nb}{\PYGZcb{}}
        A = \PYG{k}{\PYGZbs{}begin}\PYG{n+nb}{\PYGZob{}}gauss\PYG{n+nb}{\PYGZcb{}\PYGZob{}}2\PYG{n+nb}{\PYGZcb{}}
            0 \PYG{n+nb}{\PYGZam{}} 1 \PYG{n+nb}{\PYGZam{}} \PYGZhy{}9\PYG{k}{\PYGZbs{}\PYGZbs{}}
            1 \PYG{n+nb}{\PYGZam{}} 0 \PYG{n+nb}{\PYGZam{}} 2
        \PYG{k}{\PYGZbs{}end}\PYG{n+nb}{\PYGZob{}}gauss\PYG{n+nb}{\PYGZcb{}}
    \PYG{k}{\PYGZbs{}end}\PYG{n+nb}{\PYGZob{}}align*\PYG{n+nb}{\PYGZcb{}}
\PYG{k}{\PYGZbs{}end}\PYG{n+nb}{\PYGZob{}}document\PYG{n+nb}{\PYGZcb{}}
\end{Verbatim}