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( K + 1) = 3 ( A + 1)
K + 1 = 3A + 3
K - 3A = 3 - 1
K - 3A = 2
4 tahun yg lalu
(K - 4) = 5 ( A - 4)
K - 4 = 5A - 20
K - 5A = -20 + 4
K - 5A = -16
K - 3A = 2
K - 5A = -16
------------------ -
2A = 18
A = 9 thn
K - 3A = 2
K -3(9) = 2
K - 27 = 2
K = 2 + 27
K = 29