Sudut dalam sepihak = 180°
(4x + 16)° + (7x - 12)° = 180°
11x + 4° = 180°
11x = 180° - 4°
11x = 176°
x = 16°
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Sudut dalam sepihak = 180°
(4x + 16)° + (7x - 12)° = 180°
11x + 4° = 180°
11x = 180° - 4°
11x = 176°
x = 16°