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6x = 126
x = 21
ADB + 4x = 54 + 6x
ADB = 54 + 2x
ADB = 54 + 2(21)
ADB = 54 + 42
ADB = 96°
BAD + 54 + ADB = 180
BAD + 54 + 96 = 180
BAD = 30° (A)