I have this equation that needs to be solved for 'r'

2*pi*a = e^(-2r) * (2r+1)

The variable a is a constant but I need to solve for r in terms of a. I was going to take the natural log of both sides to eliminate the exponential, but that will end up putting the other r inside of a natural log function.

Is there a way to solve for 'r' in terms of 'a' here?