Answer:
x = 137
Explanation:
All quadrilaterals have a sum in angles of 360
We can see the parallel angles are the same
One angle is 43 degrees
The angle to the left (if your looking at the picture right side up) is the same angle
subtract is by 360 because the total degrees is 360
360 - 43 = 317
317 - 43 = 274
Then divide 274 by 2 because the two angles that are remaining are the same degrees
274 divided by 2 = 137
x = 137