Question

solve for x.

8^6+3x=16

Answer 1

well you minus 8^6 to the other side and solve for x

Answer 2

If it is as she wrote it then
3 x = 8^1 (2) - 8^1*8^5 = 8 (2-8^5)
x = (8/3)(2-8^5)
2 is negligible compared to 8^5
x = -(8/3)(8^5)
or about
-87380

I think she might mean
8^(6+3x) = 16
(6+3x) log 8 = log 16