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9. 7 - n ≤ 2n - 512 ≤ 3n
4 ≤ n
Bilangan prima n terkecil yang lebih besar atau sama dengan 4 adalah 5 (B)
10. (2x-1)(2) - (x+2)(3) / (3)(2) > 1 - x
4x - 2 - 3x - 6 /6 > 1-x
X - 8 > (1-x)(6)
X - 8 > 6 - 6x
7x > 14
X > 2