Solve the System Using Gaussian Elimination or Gauss-Jordan Elimination $$\begin{array} { l } - 3 x - 7 y + 7 z = 71 \\- 2 x + 7 y - 3 z = - 22 \\- 3 x - 9 y + 9 z = 87\end{array}$$

Multiple Choice

Solve the system using Gaussian elimination or Gauss-Jordan elimination.
- $$\begin{array} { l } - 3 x - 7 y + 7 z = 71 \\- 2 x + 7 y - 3 z = - 22 \\- 3 x - 9 y + 9 z = 87\end{array}$$

A) $\{ ( - 5 , - 2,6 ) \}$
B) { }
C) $\{ ( 5,2,6 ) \}$
D) $\{ ( - 5,2,6 ) \}$