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