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Verified answer
Jawab :5x + 60 = 180 (pelurus)
5x = 180 - 60
5x = 120
x = 120/5
x = 24
sd ACB + 4x = 180 (pelurus)
sd ACB + 4(24) = 180
sd ACB + 96 = 180
sd ACB = 180 - 96
sd ACB = 84
sd ABC = 180 - 60 - 84
= 36 derajat