Answer:
x = 51
x = 91
x = 20
x = 35
Explanation:
For all of these problems, it's easier to know that the outside angle is congruent to the sum of the farthest angles away from it. So take the first question as an example, it's given that the exterior angle is 86, and an angle that is the furthest away from it is 35. So all you need to do is take 86 - 35, and solve.
if you're still confused and want me to elaborate further, then just ask.