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| |x| + 3x| ≤ 2
|x + 3x| ≤ 2
|4x| ≤ 2
- 2 ≤ 4x ≤ 2
- 1/2 ≤ x ≤ 1/2
Untuk x ≤ 0
| |x| + 3x| ≤ 2
| - x + 3x| ≤ 2
|2x| ≤ 2
- 2 ≤ 2x ≤ 2
- 1 ≤ x ≤ 1
HP: {x | 0 ≤ x ≤ 1/2 U - 1 ≤ x ≤ 0 , x ∈ R}