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x in (-oo:+oo)
(3*x)/y = 6 // - 6
(3*x)/y-6 = 0
3*x*y^-1-6 = 0 // + 6
3*x*y^-1 = 6 // : 3*y^-1
x = 6/(3*y^-1)
x = 2*y
x = 2*y
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