Решите уравнение:
1) 3x^2 − 15 = 0; 3) x^2 + 8x − 9 = 0; 5) x^2 − 6x − 3 = 0;
2) 4x^2 − 7x = 0; 4) 12x^2 − 5x − 2 = 0; 6) x^2 − 3x + 11 = 0.
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