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