\left\{ \begin{array} { l } { y + z = 6 } \\ { 2 x + y - 4 z = m } \\ { 2 y - z = m } \\ { y - 2 z = - 3 } \end{array} \right.
Solve for y, z, x, m
x=6
y=3
z=3
m=3
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