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Verified answer
| 2x + 1 | < | 2x - 3 |(2x + 1)² < (2x - 3)²
4x² + 2x + 1 < 4x² - 12x + 9
2x + 1 < -12x + 9
14x < 8
x < 8/14
x < 4/7
HP : {x| x < 4/7 , x ∈ R}