The given angles are adjacent angles. What is the value of x?
In triangle DEF, an exterior angle at F is represented as 8x + 15. If the two non-adjacent interior angles are represented as 4x + 5 and 3x + 20, find the value of x.
The figure, given alongside, shows two adjacent angles AOB and AOC whose exterior sides are along the same straight line. Find the value of x.