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= 180 - 10x - 20
= 160 - 10x
15x + 40 = 160 - 10x + 5x
15x + 40 = 160 - 5x
20x = 160 - 40
20x = 120
x = 6
Sudut ACB = 160 - 10x = 160 - 10 (6) = 160 - 60 = 100