Solve the System Using the Inverse That Is Given for the Coefficient

Solve the system using the inverse that is given for the coefficient matrix.
- $x + 2 y + 3 z = 6$ $x + y + z = - 8$ $x \quad - 2 z = 12$ The inverse of $\left[ \begin{array} { l l l } 1 & 2 & 3 \\ 1 & 1 & 1 \\ 1 & 0 & - 2 \end{array} \right]$ is $\left[ \begin{array} { r r r } - 2 & 4 & - 1 \\ 3 & - 5 & 2 \\ - 1 & 2 & - 1 \end{array} \right]$ .

A) $\{ ( - 56,82 , - 34 ) \}$
B) $\{ ( - 48,88 , - 34 ) \}$
C) $\{ ( 6,0,0 ) \}$
D) $\{ ( - 8,2,2 ) \}$