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∠AEC + ∠CED + ∠DEB = 180°
(4x+4) + (3x+8) + (5x) = 180°
12x+12 = 180°
12x = 168
x = 14
∠CED = 3x+8
∠CED = 3(14) + 8
∠CED = 50°