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90° = 4x+10
90°-10 = 4x
80/4 = x
x =20
(x + 3°) + (3x + 7°) = 90°
x + 3x = 90° - 7° - 3°
4x = 80°
x = 80/4
x = 20°
maka besar ∠AOC = x + 3°
= 20° + 3°
= 23°