Question

9^10n-12=1/6561

Answer 1

Please put the necessary grouping symbols to avoid confusion :)

Answer 2

\[9^{10n-12}=1/6561\]

Answer 3

9^10n - 12 = 6561^-1
3^2(10n-12) = 3^8
2(10n-12) = 8
10n - 12 = 4
10n = 16
n = 16/10

n = 8/5