Ответы на вопрос:
(x - 1)(x - 2) + (x + 3)(x - 3) + 3x + 18 = 0 x² - 2x - x + 2 + x² - 9 + 3x + 18 = 0 2x² + 11 = 0 2x² = -11 x∉r (3x - 5)² - 5(5 - 6x) = 0 9x² - 30x + 25 - 25 + 30x = 0 9x² = 0 x = 0 (x - 7)² + 7(2x - 14) = 0 (x - 7)² + 14(x - 7) = 0 (x - 7)(x - 7 + 14) = 0 (x - 7)(x + 7) = 0 x = ± 7
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