Question 174512
(3u^-4x^-9z^-5x^9)(4u^-7*5z^8)
(3x^9)/(u^4x^9z^5)(4*5z^8)/u^7
(3x^9)(20z^8)/(u^4x^9z^5)(u^7)
(60x^9z^8)/(u^11x^9z^5)
(60x^[9-9]z^[8-5])/u^11
(60x^0z^3)/u^11
60z^3/u^11 ans.