**Perform the row operation, $-5R_1\rightarrow R_1$, on the following matrix.**
$\left[\begin{array} {ccc}
-9 & -2 & 3 & 7 \\
1 & -8 & 4 & 5 \\
2 & -4 & 2 & -6 \end{array} \right] $
[[☃ matrix 1]]
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