\left\{ \begin{array} { l } { x + y + z + u = 5 } \\ { y + z + u + v = 1 } \\ { z + u + v + x = 2 } \\ { u + v + x + y = 0 } \\ { v + x + y + z = 4 } \end{array} \right.
Solve for x, y, z, u, v
x=2
y=1
z=3
u=-1
v=-2
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