Algebraic fractions
9/3x2 - 3y2 + x/xy - x2 = 9/3(x2-y2) + x/x(y-x) = 3/(x-y)(x+y) + 1/y-x = 3/(x-y)(x+y) - 1/x-y = 3-1(x+y)/(x-y)(x+y) = 3-x-y/(x-y)(x+y)
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