Given the matrices in Problems 16-19, perform elementary row operations to obtain a 1 in the row

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Given the matrices in Problems 16-19, perform elementary row operations to obtain a 1 in the row 1, column 1 position.

\([B]=\left[\begin{array}{rrr:r}-2 & 3 & 5 & 9 \\ 1 & 0 & 2 & -8 \\ 0 & 1 & 0 & 5\end{array}\right]\)

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