Question 209010
(x^4 y^-5/x^-8 z^2)^-m  (2x^-5y/y^-8 z^-5)^-3

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= (x^12/y^5z^2)^-m (2y^8z^5/x^5)^-3

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= (y^5z^2/x^12)^m (x^5/2y^8z^5)^3

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= (y^5m*z^2m/x^12m) (x^15/(8*y^24*z^15))
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= x^(15-12m) * y^(5m-24) *z^(2m-15)

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Cheers,
Stan H.