Решите уравнение: 357
1) 3x2 + 6x=8x2 - 15x;
3) 10x + 7x2 = 2x2 + 8x;
2) 17x² – 5x = 14x² + 7x;
4) 15x + 9x2 = 7x2 +10x.​
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