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x in (-oo:+oo)
z = 3*x-((1/2)*y) // - 3*x-((1/2)*y)
(1/2)*y-(3*x)+z = 0
(1/2)*y-3*x+z = 0
1/2*y-3*x+z = 0 // - 1/2*y+z
-3*x = -(1/2*y+z) // : -3
x = (-(1/2*y+z))/(-3)
x = (1/2*y+z)/3
x = (1/2*y+z)/3
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