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79 Factoriser les expressions suivantes.
a) (4x-6)(7x+8) + (4x-6)(3x+16)
b) (3x-7)(5x+13) - (3x-7)(3x+11)
c) (5x+1)(9+4x) - (5x+1)(10x-3)
d) (2x-3)² - (4x-6)(6x + 1)