Points A, B, C and D are on the circle. The ∠ACB and ∠ADB are angles subtended by the same

Points A, B, C and D are on the circle. The ∠ACB and ∠ADB are angles subtended by the same arc AB. If arc AB measures (5x – 30)° and m∠ACB = (x + 15) °, what is m∠ADB?

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