Correct: x2 + x =0, x2 - 5x = 3, -3x2 + 7x -10 = 0, 5x2 + 3x =12, 2x = x2, Incorrect: x + 3 = 0, 2x + 5x = -7, 5x3 - 8 = -11, x = 15, xy - 2x = 5,

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