**Perform the row operation, $-4R_2\rightarrow R_2$, on the following matrix.**
$\left[\begin{array} {ccc}
5 & 7 & 8 & 5 \\
4 & 1 & 4 & 7 \\
2 & 0 & 2 & 1 \end{array} \right] $
[[☃ matrix 1]]
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