Question

simplify answer is 1/25
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Answer 1

(5^(-2n-6)×5^2 (2n-7))/5^6n

=(5^(-2n-6)×5^(4n-14))/(5^6n)

=(5^(-2n-6+4n-14))/5^6n

=(5^(2n-20))/5^6n

=5^(2n-20-6n)

2n-20-6n=0

-4n-20=0

n=-5