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(C - (S - α/2)) - 24°)/3 = 3(C - α/2)/5
5(C - (S - α/2)) - 120° = 9(C - α/2)
5(90° - (180° - α/2)) - 120° = 9(90° - α/2)
5(90° - ((360° - α)/2) - 120° = 9((180° - α)/2)
5((180° - 360° + α)/2) - 120° = (1,620° - 9α)/2
(900° - 1,800° + 5α - 240°)/2 = (1,620° - 9α)/2
5α - 1,140° = 1,620° - 9α
14α = 2,760°
α = 197.14