Hello, I know the topic sounds very generic, but I've got a specific case that seems to be problematic. I don't know if the issue lies in W|A not being able to solve the problem, or in me not understanding how to input the equations correctly.

I have a nonlinear PDE that I want to solve for ?. When I type: "solve f(x)??(x)/?x+?(x)(?f(x)/?x+?G/?)=-((?M^2)/?)BV*e^(-x)" it doesn't really give me any useful solution, but it seems to understand the syntax correctly.

I want to specify my f function and so I write: "solve f(x)??(x)/?x+?(x)(?f(x)/?x+?G/?)=-((?M^2)/?)BVe^(-x) where f(x)=A1+(A2+A3)e^(-2x)" or "solve f(x)??(x)/?x+?(x)(?f(x)/?x+?G/?)=-((?M^2)/?)BVe^(-x), f(x)=A1+(A2+A3)e^(-2x)" but now the site gives me no results at all, like it doesn't understand what has been written.

I have a Pro account, I purchased it precisely to get help with equations like this. Do I need to rewrite the problem in some way or is it impossible to compute using ths web app?