Algebra/ASSIGNMENTS/matrices/Inverse

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Find the inverses of the matrices

[math]\begin{bmatrix}1&2&3\\2777&3&4\\5&-6&7\end{bmatrix}[/math] and [math]\begin{bmatrix}12&12&-3\\207&123&-34\\50&61&-7\end{bmatrix}[/math]