If x-1y2x3y-21/3÷x6y-3x-2y31/2=xayb, prove taht a+b=-1, ehere x and y are different positive primes.

If ${(\frac{x^{- 1} y^{2}}{x^{3} y^{- 2}})}^{1 / 3} \div {(\frac{x^{6} y^{- 3}}{x^{- 2} y^{3}})}^{1 / 2} = x^{a} y^{b}$ , prove taht a+b=-1, ehere x and y are different positive primes.

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