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x in (-oo:+oo)
(1/2)*y+4*z = x // - x
(1/2)*y-x+4*z = 0
1/2*y-x+4*z = 0 // - 1/2*y+4*z
-x = -(1/2*y+4*z) // * -1
x = 1/2*y+4*z
x = 1/2*y+4*z
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