Correct: (x + 2)(x - 7 ) = 0, 3x2 - 5x = - 10, x2 + 6x - 5 = 0, x(2x - 4) = 9, 10x2 + 5x - 14 = 7, Incorrect: x + y = 0, 2x + 4y = 7, 3(3x -4) = 0, 6x = 9, 2x + 6y,

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