Answer:
x-degree is 150 degrees
Explanation:
On a 180-degree plane the 150-degrees makes the unmarked angle 30-degrees. Since both unmarked angles are mirrors of each other (and unmarked) it can be assumed they are both 30-degrees (or that they have the same degree measurement). Therefore, it can be assumed from the image that the x-degree angle (mirroring the 150-degree angle) is 150-degrees.