Solve the linear system LaTeX: \displaystyle \begin{cases} 3 x - 3 y - 3 z = -12 \\ 8 x + 8 y - 2 z = 24 \\ - x + 9 y - 6 z = -8 \\ \end{cases}

The Solution is LaTeX: \displaystyle (2, 2, 4) .