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