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1 - x - 9 ≤ 2x + 7
-x + 1 - 9 ≤ 2x + 7
-x - 8 ≤ 2x + 7
-x - 2x ≤ 7 + 8
-3x ≥ 15
x ≥ 15/-3
x ≥ -5
Hp= {-5,-4,-3,-2,-1,0,1,2,3,4,..}