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x in (-oo:+oo)
(1/2)*y = 4*x-6 // - 4*x-6
(1/2)*y-(4*x)+6 = 0
(1/2)*y-4*x+6 = 0
1/2*y-4*x+6 = 0 // - 1/2*y+6
-4*x = -(1/2*y+6) // : -4
x = (-(1/2*y+6))/(-4)
x = (1/2*y+6)/4
x = (1/2*y+6)/4
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