(x-4)(x+5) - x^2 + x - 20, x^2 + 5x + 6 - (x+3)(x+2), (3x-7)(2x-4) - 6x^2 - 26x + 28, (x+4)(5x+2) - 5x^2 + 22x + 8, x^2 - 9x + 18 - (x-3)(x-6), -x^2 + 9x - 14 - (-x+7)(x-2), (-x-6)(-3x-5) - 3x^2 + 23x + 30, 4x^2 - 30x -54 - (4x+6)(x-9), x(8x+3) - 8x^2 + 3x, -5x(2x-8) - -10x^2 + 40x,

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