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x in (-oo:+oo)
(1/2)*y+4 = 3*x // - 3*x
(1/2)*y-(3*x)+4 = 0
(1/2)*y-3*x+4 = 0
1/2*y-3*x+4 = 0 // - 1/2*y+4
-3*x = -(1/2*y+4) // : -3
x = (-(1/2*y+4))/(-3)
x = (1/2*y+4)/3
x = (1/2*y+4)/3
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