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x in (-oo:+oo)
x = 5/y // - 5/y
x-(5/y) = 0
x-5*y^-1 = 0
x-5*y^-1 = 0 // + -5*y^-1
x = -(-5*y^-1)
x = 5*y^-1
x = 5*y^-1
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