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75 x (1/7)5

1/7 = 7-1

So, (1/7)5 = (7-1)5 = 7-5

Replacing this in the original expression gives,

75 x 7-5 = 7(5 -5) = 70 = 1

Alternatively, (1/7)5 = 15/75 = 1/75

we could then write, 75 x 1/75 = 1

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