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4n - 8n = -8 - 12
-4n = -20
n = 5
2n + 1 = 10 + 1 = 11
Jadi,
4n + 12 = 8n - 8
12 + 8 = 8n - 4n
20 = 4n
n = 20/4
n = 5
Maka kalo n nya udah ketauan, kita tinggal masukin ke yang ingin di hitung.
2. n + 1
2 . 5 + 1
10 + 1 = 11