(3x + 2) + (5x + 7)= - 8x + 9, (4x² + 3x -1) + (2x²- 5x + 4)= - 6x² - 2x + 3, (6x + 4) - (2x + 5)= - 4x-1, (7x² - 3x + 8) - (5x²+2x-6) - 2x²-5x+14, (x+2)(x+3)= - x²+5x+6, (2x-1)(x-4)= - 2x²-9x+4, (x+5)(x²-3)= - x³+5x²-3x-15,

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