Ok, I really don't know what I'm doing when it comes to Maple, so maybe I'm not expressing what I need to do clearly.  I have everything defined down to the point where I only have one variable in my equation.  It just happens to be on both sides of the equation, and I need to solve for it.  I aologize if this still doesn't help clarify, I'm just getting slightly frustrated.

Ummm, I think I get what you mean, but I don't have any constant value to enter for P, that's what I need to solve for.

That was totally my problem.   ...well, one of them, but it's a good start. Thanks!