Answer
See below
Work Step by Step
The solution of a $3 \times 3$ matrix is $\begin{bmatrix}
1 & 0& -2\\
3 & -4 & 0\\
2 & 0 & 5
\end{bmatrix}\\=-6[(0)(-5)-(-2)(1)]-1[(3)(5)-(-2)(-1)]+8[(3)(1))-(0)(-1)]\\=-1$
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