Je n'arrive pas cette exercice , svp aidez moi !

Consigne : Supprimer les parenthèses , puis réduire

A= 3a + 5 - (2a+7) + (8-5a)

B= -b + 4 + (3b-2) - (8b-5)

C= 6 - 5c + 3c - (4-6c) + 5 + (7-2c)

D= d - 1 - (3d+4) + (5-4d) - (7d+5) + 5

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