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