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