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.
\([D]=\left[\begin{array}{rrr:r}5 & 20 & 15 & 6 \\ 7 & -5 & 3 & 2 \\ 12 & 0 & 1 & 4\end{array}ight]\)
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