plz plz solve it ....if u can
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Answer:
(5^-1 - 7^-1)^-1
= (1/5^1 - 1/7^1)^-1
= (1/5 - 1/7)^-1
= (7-5/35)^-1
= (2/35)^-1
= 1÷2/35^1
= 1*35/2
= 35/2. ans.
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