Решите уравнение: 1) 3^2 − 18 = 0; 3) x^2 − x − 20 = 0; 5) x^2 + 6x − 2 = 0;
2) 8^2 − 3x = 0; 4) 3x^2 − 2x − 8 = 0; 6) x^2 − 4x + 6 = 0.
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