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|3x + 2| ≤ 5
|3x + 2| ≤ 5
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-5 ≤ 3x + 2 ≤ 5
-5 - 2 ≤ 3x + 2 - 2 ≤ 5 - 2
-7 ≤ 3x ≤ 3
-7/3 ≤ 3/3x ≤ 3/3
-7/3 ≤ x ≤ 1
HP = { x | -7/3 ≤ x ≤ 1, x ∈ R}