Given the matrices in Problems 24-27, perform elementary row operations to obtain a 1 in the second

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Given the matrices in Problems 24-27, perform elementary row operations to obtain a 1 in the second row, second column without changing the entries in the first column.

\([B]=\left[\begin{array}{rrr:r}1 & 5 & -3 & 5 \\ 0 & 3 & 9 & -15 \\ 0 & 2 & 1 & 5\end{array}ight]\)

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