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a itu bilangan yg besar
a - b = 18
b = a - 18
5b + 2 = 2 1/3 x a - 8
5b + 2 = 7/3 a - 8
5(a-18) + 2 = 7/3 a - 8
5a - 90 + 2 = 7/3 a - 8
5a - 88 = 7/3 a - 8
8/3 a = 80
a = 30
maka b = 30 - 18 = 12