Réponse :Bonjour,
A = 2x + 2 - 3= 2x - 1
B = -5 + (6 - 9x) + x = -5 + 6 - 9x +x = -8x + 1
C= -3 + (5-x)*10 + x = -3 + (50 - 10x) + x = -3 + 50 - 10x + x = -9x + 47
A toi de faire la suite :)
Bon courage