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2x - 3x ≤ -4 - 1
-x ≤ -5
x ≤ -5 : -1
x ≥ 5
HP = { 5, 6, 7, 8, 9, ... }
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-3x + 17 < 15 - 2x
-3x + 2x < 15 - 17
-x < -2
x < -2 : -1
x > 2
HP = { 3, 4, 5, 6, 7, ... }