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15x - 6 ≤ -64 ( 3x + 1 )
15x - 6 ≤ -192x + -64
15x + 192x ≤ -64 + 6
207x ≤ -58
x ≤ -58 : 207
x ≥ -0,28
x ≥ 0
HP = { 0 , 1 , 2 , 3 , 4 , ... }