Simplify: `((-54x^6y)/(2x^-3 y^4))^(4/3)`  

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The expression `((-54x^6y)/(2x^-3 y^4))^(4/3)` has to be simplified

`((-54x^6y)/(2x^-3 y^4))^(4/3)`

=> `(-27)^(4/3)*(x^9)^(4/3)*(y^-3)^(4/3)`

=> `(81*x^12)/(y^4)`

The simplified form of `((-54x^6y)/(2x^-3 y^4))^(4/3) = (81*x^12)/(y^4)`

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