Write an expression in terms of x that represents the measure of angle designated by the symbol

If I will only base this problem, I cannot answer it because no illustration is provided. Luckily, I found a similar problem from another website, which is shown in the attached picture. We have to find ? in terms of x. Since this is a triangle, the sum of all interior angles is 180°. Thus,

? = 180 - 43 - x
? = 137 - x

Okay i already have it though