9^n-81=3^2n-9^2=(3^n-9)(3^n+9)
((3^n-9)(3^n+9))/(3^n-9)=3^n+9
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9^n-81=3^2n-9^2=(3^n-9)(3^n+9)
((3^n-9)(3^n+9))/(3^n-9)=3^n+9