Which equation can you use to solve for x?

x + 87 = 180

x + 87 = 111

180−x=111

x + 111 = 180
The figure contains a pair intersecting lines. One of the four angles formed by the intersecting lines is labeled 111 degrees. The angle opposite and not adjacent to this angle is broken into two smaller angles by a ray that extends from the point where the two lines intersect. One of these smaller angles is labeled 87 degrees, and the other smaller angle is labeled x degrees.