me assume that stuf shood be . . . term1*(term2-term3) . . . term1=(-3)^-2/y=1/9y . . . term2=9*y^0/(-x)=-9/x . . . term3=-3x/y . . . (1/9y)*[(-9/x) -3x/y] . . . =-(1/9y)[(9y+3x^2)/xy] . . . =-(3/9)(1/y)*[(3y +x^2)/xy] . . . =-(1/3)(1/xy^2)*(3y+x^2) . . . or -(1/3)*(3y+x^2) / (xy^2) . . .