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