f(x) = (2x-3) / (x+4) is one-to-one. Find it's inverse, state the domain of f, and find the range using f-1.

So I did the work and got an inverse of 3-3x.

And range and domain always give me trouble. I know the range is the domain of the inverse, etc etc. . .

First of all, is my answer correct? LOL This is my new fav site.