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BCA+CAB+ABC = 180
(x+30)+(2x+15)+60 = 180
x+2x= 180- (60+30+15)
3x= 75
x=25
b.) BAC = CAB = 2x+15, subsitusikan x ke persamaan CAB
jadi BAC = CAB = 2. 25+15 = 65
BCA = x+30, subsitusikan x ke persamaan BAC = 25+30=55