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Bonjour, développer, simplifier et réduire
A= -6x(7x - 8) - (8x - 9)(4x – 5)
B = (6x – 7)(9x + 3) - (6 - 4x)(-3x - 2)
C = (3x - 3)(2x - 3)(5x - 3)
D = (4x-7)(7x - 8) - (5x -9) - 2x(5x - 4)

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