x2 - 4 - (x - 2) ( x + 2), (x2 + 4) - (x + 2i)(x -2i), 12x + 54 - 6(2x + 9), 20x - 15 - 5(4x - 3), 32x + 28y - 4(8x + 7y), x4 - x2 -12,

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