Hello!

Find $\displaystyle f(x)$ and $\displaystyle g(x)$ if

$\displaystyle f(2x+1)+2g(2x+1)=2x$ ^ $\displaystyle f(\frac{x}{x-1})+g(\frac{x}{x-1})=x$

I would appreciate very much if anyone gives me an information on how to solve this type of problems.

Thank you!