Solve the System of Linear Equations Using Matrices $$\left\{ \begin{array} { r r } - 3 x - y - 2 z = & - 29 \\- 8 x + 7 y - 7 z = & 3 \\7 x - 3 y + z = & 5\end{array} \right.$$

Multiple Choice

Solve the system of linear equations using matrices.
- $$\left\{ \begin{array} { r r } - 3 x - y - 2 z = & - 29 \\- 8 x + 7 y - 7 z = & 3 \\7 x - 3 y + z = & 5\end{array} \right.$$

A) $( 4,4,9 )$
B) $( - 4,9,8 )$
C) $( 4,9,4 )$
D) $\varnothing$