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x in (-oo:+oo)
x = 9/y // - 9/y
x-(9/y) = 0
x-9*y^-1 = 0
x-9*y^-1 = 0 // + -9*y^-1
x = -(-9*y^-1)
x = 9*y^-1
x = 9*y^-1
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