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