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x in (-oo:+oo)
x/y = 13/5 // - 13/5
x/y-(13/5) = 0
x/y-13/5 = 0
x*y^-1-13/5 = 0 // + 13/5
x*y^-1 = 13/5 // : y^-1
x = 13/5/(y^-1)
x = 13/5/(y^-1)
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