### Perform the indicated operation(s) on the matrix.

\(\left[\begin{array}{rrr|r}-2 & -1 & 4 & -26 \\
5 & -2 & 3 & 9 \\
2 & 0 & -5 & 33\end{array}\right]\begin{array}{ll}\phantom{1} & -\frac{1}{2}R_1 \to R_1 \\
\phantom{1} & \\
\phantom{1} & \end{array}\)