Determine the missing value using the sum of interior angles of a polygon ex 3

The video tutorial explains how to determine the measure of interior angles in polygons, focusing on non-regular polygons. It introduces the formula for the sum of interior angles, which is (n-2) * 180 degrees, where n is the number of sides. The tutorial guides viewers through setting up and solving equations to find unknown angles, emphasizing the importance of writing out equations to avoid mistakes. The video concludes with tips for solving such problems efficiently.

Explain the process of setting up the equation to find the missing angle in the polygon.

What steps should be taken to solve for the variable X in the equation derived from the angles?