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4x - 24 + 3x + 9 = 90°
4x + 3x - 24 + 9 = 90°
7x - 15 = 90°
7x = 90° + 15
7x =105°
x = 105°/7
x = 15°
<BAC = 4x - 24
<BAC = 4.15 - 24
<BAC = 60 - 24
<BAC = 36⁰