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x in (-oo:+oo)
x/y = 6/8 // - 6/8
x/y-(6/8) = 0
x/y-3/4 = 0
x*y^-1-3/4 = 0 // + 3/4
x*y^-1 = 3/4 // : y^-1
x = 3/4/(y^-1)
x = 3/4/(y^-1)
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