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(x+y-z) (-1) - (-x-y+z)
-x-y+z + x+y-z
0
y- (x-(y+z(-x+y))+x)
y- (x-(y-zx+zy)+x)
y- (x-y-zx-zy+x)
y -x+y +zx+zy-x
2y-2x +zx+zy