(3^(5/7))^n = 3
(3^(5/7))^n = 3 take the log of both sides
log (3^(5/7))^n = log (3 ) and we can write
n * log (3^(5/7)) = log (3) divide both sides by log (3^(5/7))
n = log(3) / log (3^(5/7)) = 7/5
