Answer:
x = 31 degrees
Explanation:
Transversals! You are given that line m is parallel to line n. Therefore, the angle above 84 degrees is equal to 96 degrees.
Opposite angles are congruent, so you set 3x+3=96
Solve for x.
Another way to think of this is that a straight angle is 180 degrees. That means both angles added together must equal to 180 degrees. 3x+3+84=180
Solve for x