Answer: x/(z*(y^7))^4
Explanation:
(x^5 y^4 z^-4)^-3/(x^-4 y^4 z^4)^4=
(x^-15 y^-12 z^12)/(x^-16 y^16 z^16)=
(z^12 x^16)/(x^15 y^12 y^16 z^16)=
x/(z^4 y^28)=x/(z*(y^7))^4
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