Question: Solve x + y + z + w = 1 x - y + z - w = - 1 x + 2 y +

Solve
x+y+z+w=1
x-y+z-w=-1
x+2y+3z+4w=4
Solve x+y+z+w=1 x-y+z-w=-1 x+2y+3z+4w=4

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