# How do you solve 9^n + 10 + 3 = 81 ?

${9}^{n} + 13 = 81$
${9}^{n} = 81 - 13 = 68$
${\log}_{9} \left(68\right) = n$
$n = {\log}_{9} \left(68\right) = \ln \frac{68}{\ln} \left(9\right) = 1.92$