Réponse :
A = (x + 3) + (4x - 5)
A = x + 3 + 4x - 5
A = 5x - 2
B = 6 - 2t - (4t - 8)
B = 6 - 2t - 4t + 8
B = -6t + 14
C = - (8a + 3) - 4a
C = -8a - 3 - 4a
C = -12a - 3
D = (3y + 7) + (-5y + 3)
D = 3y + 7 - 5y + 3
D = -2y + 10
E = 5z - 6 - (7 - 2z) + 3z
E = 5z - 6 - 7 + 2z + 3z
E = 10z - 13
F = (3 - 4x) - (-2x + 8)
F = 3 - 4x + 2x - 8
F = -2x - 5
j'espère t'avoir aidé !