CALCULE: x-y=2 e z-x=4
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x-y=2 > -y=2-x (-1) > y= - 2+x > y=- 2 + 2 > y=0
x-(2+x)=2 > x-2+x=2 > 2x=2+2 > 2x=4 > x=2
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z-x=4 > -x = 4 - z (-1) > x=- 4 + z > x= -4 + 0 > x= -4
z- (- 4 + z ) = 4 > z + 4 - z = 4 > z=0
x-(2+x)=2 > x-2+x=2 > 2x=2+2 > 2x=4 > x=2
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z-x=4 > -x = 4 - z (-1) > x=- 4 + z > x= -4 + 0 > x= -4
z- (- 4 + z ) = 4 > z + 4 - z = 4 > z=0
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