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x in (-oo:+oo)
x/y = 4/7 // - 4/7
x/y-(4/7) = 0
x/y-4/7 = 0
x*y^-1-4/7 = 0 // + 4/7
x*y^-1 = 4/7 // : y^-1
x = 4/7/(y^-1)
x = 4/7/(y^-1)
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