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B . yang harus dilakukan pertama kali ialah mencari nilai x40x + 27 + 10x + 3 = 180 (karenaadb=180)
50x + 30 = 180
50x + 30 - 30 = 180 - 30
50x = 150
sama sama dibagi 50 jadi
x = 3
jadi .......
ADC = 40x( 3 ) + 27
= 120 + 27
= 147