Besoin d'aide svp !! Je suis bloqué sur cet exercice ! A = 3(x+2) + (7+4x)(7-6x)
B = 4 (x+9) - (7+x)(x+1)
C = -2(1-3x) - (3x+2)(x-5)
D = -3(a au carré+2) - (a-3)(2a+7)

Merci d'avance !!
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