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