I need help with the following problems:

Question

~23. 3^(x-6)=81 How do you solve this? I'm not sure what becomes of the -6.

~24. 11-6^x=3

Answer 1

(x-6) log 3 = log 8
x-6 = log 8 / log 3
x = 6 + (log 8/log 3)