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