The answer to this question is 138. With any flat line, the angles always equal 180 degrees. To solve this, work backwards, and find x. First, create an equation. This equation will be 15x - 30 = 180 (Combine all angles and equal 180.) Next, add 30 to both sides to get 15x = 210. Finally, divide both sides by 15, and you get x=14. Now, multiply 12 by 14, and you get 168. Subtract 30 from that and you get 138. To check this, solve the other angle by multiplying 3 by 14, and you get 42. Add 42 and 138 to make sure it equals 180, and it does! I hope this helped! Could I possibly get brainliest?
