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C = B + 6 +
A + C = 2B + 4
A + B + C = 56
(A + C) + B = 56
2B + 4 + B = 56
3B = 56 - 4
3B = 52
B = 52/3
= 17 tahun 4 bulan
A = B - 2
= 15 tahun 4 bulan
C = B + 6
= 23 tahun 4 bulan