In triangle ABC, the measure of angle BAC = 5x + 8, the measure of angle ABC = 6x + 22, and the measure of angle BCA = 3x − 25.

Find the value of x.
Find the measure of angle 3. Show your work.

(I really want to find the answer on my own, but I need help getting there. I have no clue what the first step is. I have my book open, but I can't find the right chapter! Please Help!)