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x in (-oo:+oo)
x = 10/y // - 10/y
x-(10/y) = 0
x-10*y^-1 = 0
x-10*y^-1 = 0 // + -10*y^-1
x = -(-10*y^-1)
x = 10*y^-1
x = 10*y^-1
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