(x-3)(x+3) - x2 -9, (x+4)2 - x2 + 8x + 16, (x-7)2 - x2 - 14x + 49, x2 + 5x +6 - (x + 3)(x + 2), x2 - 18x + 80 - (x - 10)(x - 8), (a-b)(a+b) - a2- b2, a2- 7a - 30 - (a - 10)(a + 3), (x - 7)(x + 5) - x2 - 2x + 35, x2 + 10x + 16 - (x + 8)(x + 2), (2x + 1)2 - 4x2 + 4x + 1, (5x - 3)(5x + 3) - 25x2 - 9, (2x - 7y)2 - 4x2 - 14xy -49y2,

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