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3n.log5 = log 9
3n = ^5log 9
n = ^5log ³√9
5^(2-n) = 5²/5ⁿ
5^(2-n) = 25/5^(^5log ³√9)
5^(2-n) = 25/³√9
5^(2-n) = 25/9 × ³√81