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(2/3)^(-5)x\ (5/7)^(-5) is equal to (...

`(2/3)^(-5)x\ (5/7)^(-5)` is equal to
(a)`(2/3x5/7)^(-10)` (b) `(2/3x5/7)^(-5)` (c) `(2/3x5/7)^(25)` (d) `(2/3x5/7)^(-25)`

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