Help please

There are 3 unknown functions, f(x), g(x), and j(x). Given the following compositions between the functions, which of the functions are inverses ? fig(x)) = 2x - 3 fli(x)) = 2x + 5 g(f(x)) = 2x -1 gli(x)) = x j(f(x)) = 2x + 3 j(g(x)) = x