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Verified answer
|2x+1| ≥ |x-3|(2x + 1)² ≥ (x - 3)²
4x² + 4x + 1 ≥ x² - 6x + 9
3x² + 10x - 8 ≥ 0
(3x - 2)(x + 4) ≥ 0
x ≤ -4 atau x ≥ 2/3