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