I'm not to sure what to do when the base is = to x

Just use the standard manipulations that are valid for logs. For example:


log_x a + log_x b = log_x(a*b)


You'll end up with a result like this:


log_x C = D


From this just apply the definition of the log:

If
log_x a = b, then
x^b = a.
From that you'll be abet to determine the value of x.