discrete mathematics - How would I show this bijection and also calculate its inverse of the function?

I want to show that $f(x)$ is bijective and calculate it's inverse.

Let $$f : \mathbf{R} \to \mathbf{R}$$ be defined by $f (x) = \frac{3x}{5} + 7$

I understand that a bijection must be injective and surjective but I don't understand how to show it for a function.