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