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3x + 15° + 2x + 10° = 180°
5x + 25° = 180°
5x = 180° - 25°
5x = 155°
x = 31°
besar pelurus ∠KLN adalah besar ∠MLN = 2x + 10 = 2(31) + 10 = 62 + 10 = 72°