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6 + 15 < 2x + 5x
21 < 7x
3 < x
X = (4,5,6,7,8.....) x = bil. Bulat
-5x - 2x < -15 - 6
-7x < -21
x > -21 : -7
x > 3
HP = { 4, 5, 6, 7, ... }