ABCDE is a pentagon with interior angles adding to 540°. ∠A = 90°, ∠B = 180° − 65° = 115°, ∠C = 180° − 80° = 100° and ∠D = 115°, so ∠E = 540° − 420° = 120°. x is supplementary to it: x = 60°.