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12 = 3b jadi b = 4
2c = b --> 2c = 4 jadi c = 2
a+b+c = 10
a = 4
b = 4
c = 2
jalannya : (4a 5) = (16 5) = (4.4 5) = (16 5)
= (16 5) = (16 5)
= 80 = 80
(12 2c) = (3b b) = (12 2.2) = (3.4 4)
= (12 4) = (12 4)
= 48 = 48