Given the matrices in Problems 32-35, perform elementary row operations to obtain a 1 in the third row, third column without changing the entries in the first two columns.

\([\mathrm{D}]=\left[\begin{array}{rrrr:r}1 & 0 & -8 & 2 & 8 \\ 0 & 1 & -1 & 3 & 2 \\ 0 & 0 & 2 & 0 & 10 \\ 0 & 0 & -2 & 1 & 6\end{array}ight]\)