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(5a-7b)^(3)+(9c-5a)^(3)+(7b-9c)^(3)...

`(5a-7b)^(3)+(9c-5a)^(3)+(7b-9c)^(3)`

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The correct Answer is:
`3(5a-7b)(9c-5a)(7b-9c)`
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