Matrix/Elementary matrices/Identity matrix/2/Exercise

Let

${}M={\begin{pmatrix}3&5&-1\\4&7&2\\2&-3&6\end{pmatrix}}\,.$

Find elementary matrices ${}E_{1},\ldots ,E_{k}$ such that ${}E_{k}\circ \cdots \circ E_{1}\circ M$ is the identity matrix.

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