Решите уравнение: 1) (x+4)^2 - x^2 = 2x + 1
2) (x + 7)(x - 7) - (x-3)^2 = 53
3)7x^2 = (2x + 1)^2 + 3x^2 - 5
4)(x+3)(x-2) - (x-3)(x+2) - 5 = 6x - 7
2) (x + 7)(x - 7) - (x-3)^2 = 53
3)7x^2 = (2x + 1)^2 + 3x^2 - 5
4)(x+3)(x-2) - (x-3)(x+2) - 5 = 6x - 7
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