Question 580885
If the base is ten, just write log, it's understood:

2logx = 10

log(x) = 5

10^5 = x 

x = 100,000

<p>

9*log(x-4) = 11

log(x-4) = 11/9

x-4 = 10^(11/9)

x = 10^(11/9) + 4

x = 16.68 + 4 = 20.68