Interior angles on parallel lines cut by a traversal are supplementary (they add up to 180°). These can be identified as "c" angles, due to their shape. Knowing this, we can figure out the value of x: 7x+(2x+36)=180 7x+2x+36=180 Simplify the equation 9x+36=180 Collect like terms 9x=144 Divide by 9 on both sides to isolate x x=16
