x^-2 - 9y^-2/x^-1 + 3y^-1

x^−2 − 9y^−2/x^−1 + 3y^-1

= −9x^3y+3x^2y^2+y^3/x^2y^3

= −9x^3+3x^2y+y2/x^2y^2

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