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x in (-oo:+oo)
x/y = 9/4 // - 9/4
x/y-(9/4) = 0
x/y-9/4 = 0
x*y^-1-9/4 = 0 // + 9/4
x*y^-1 = 9/4 // : y^-1
x = 9/4/(y^-1)
x = 9/4/(y^-1)
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