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