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Kuadratkan kedua ruas:
(x - 2)² ≤ (x + 1)²
(x - 2)² - (x + 1)² ≤ 0
((x - 2) + (x + 1))((x - 2) - (x + 1)) ≤ 0
(2x - 1)(- 3) ≤ 0
- 6x + 3 ≤ 0
6x ≥ 3
x ≥ 1/2