x2 + 2x = -5, x2 = 5x - 6, 2x2 - 7x + 3 = 0, x2 - x = 3, x2 + 4x + 4 = 0, 3x2 = -x + 2, x2 + x + 1 = 0, 2x2 + 2 = -5x .

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