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b - 4 = 2/3 (a - 4)
b - 4 = 2/3 (8 + b - 4)
3 x [b - 4] = 3 x [ 2/3 (4+b)
3b - 12 = 2 (4 + b)
3b - 12 = 8 + 2b
b = 20
usia bitha yaitu 20 tahun