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Maka :
3 + N + N + 3 + 4 + 5 = 15 + 2N
15 + 2N = 9 + 6 + 2N
Maka 6 + 2N harus habis dibagi 9,
N harus 6
mengapa ???
Karena 6 + 2N = 6 + 2(6) = 6 + 12 = 18
18 juga habis dibagi sembilan
semoga membantu