The steps to find the inverse: f(x) = 3 - 2x
1) Replace f(x) with y (makes writing easier) ---> y = 3 - 2x
2) Exchange the variables x and y ---> x = 3 - 2y
3) Solve the new equation for y: x - 3 = -2y
(x - 3)/-2 = y
(3 - x)/2 = y
4) Replace y with f^-1(x): f^-1(x) = (3 = x)/2
Try this process for the second problem; if you have problems, repost.