\left\{ \begin{array} { l } { y - z + 2 w = 0 } \\ { 3 x + 2 y + w = 0 } \\ { x + 2 w = 6 } \\ { - 2 x - 2 z + 5 w = 6 } \end{array} \right.
Solve for y, z, w, x
x\in \mathrm{R}
y=-\frac{5x}{4}-\frac{3}{2}
z=-\frac{9x}{4}+\frac{9}{2}
w=-\frac{x}{2}+3
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