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..., 6, 13, 20, 27Pola: +7
Maka, angka sebelum 6 adalah:
x + 7 = 6
x = 6 - 7
x = -1
Barisan bilangan tersebut menjadi: -1, 6, 13, 20, 27
..., 7, 14, 21, 28
Pola: + 7
Maka, angka sebelum 7:
x + 7 = 7
x = 7 - 7
x = 0
Barisan bilangan tersebut menjadi: 0, 7, 14, 21, 28