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Adik = A
Delapan tahun lalu
(K-8)=2(A-8)
K-8 = 2A-16
K - 2A = -8
K+A=40
K - 2A = -8
3A = 48
A=16
2016 - 16 = 2000
Maka adik lahir pada tahun 2000