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x in (-oo:+oo)
x/y = 18/7 // - 18/7
x/y-(18/7) = 0
x/y-18/7 = 0
x*y^-1-18/7 = 0 // + 18/7
x*y^-1 = 18/7 // : y^-1
x = 18/7/(y^-1)
x = 18/7/(y^-1)
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