\left[\begin{array}{cccc|c}
1 & 2 & 0 & 1 & 0 \\
0 & 0 & 1 & 3 & -3 \\
1 & 2 & 1 & 4 & -3 \\
0 & 0 & 0 & 0 & 0 \end{array}\right]