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x² - 10x + 25 ≥ 9x² - 18x + 9
0 ≥ 9x² - x² - 18x + 10x + 9 - 25
0 ≥ 8x² - 8x - 16
0 ≥ x² - x - 2
0 ≥ (x - 2) (x + 1)
2 ≥ x ≥ - 1