How do you create the arrows indicating matrix row operations in a non-array environment? I'm trying to have the same output as:
I currently have
\item
\[
\begin{bmatrix}
1 & 7 & 3 & -4 \\
0 & 1 & -1 & 3 \\
0 & 0 & 0 & 1 \\
0 & 0 & 1 & -2
\end{bmatrix}
\begin{bmatrix}
1 & 7 & 3 & -4 \\
0 & 1 & -1 & 3 \\
0 & 0 & 1 & -2 \\
0 & 0 & 0 & 1
\end{bmatrix}
\]
and I want to place the arrow in between.