J'ai besoin d'aide : Supprimer les parenthèses, puis réduire :
A= -5 + (-a + 2)
B= 4a - (-5 + a)
C= -1 + (-3b + 4)
D= 5 - 2y - (7 - 4y)
E= 3a + 5 - (2a + 7) + (8 - 5a)
F= 6 - 5c - (4 - 6c) + 5 + (7 - 2c)
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