J’aimerais avoir de l’aide pour ces exercices merci d’avance

6x + 8 = 3x - 19

6x - 3x = - 19 - 8

3x = -27

x = - 27/3 = -9

7 + a = 17 + 3a

2a = - 10

a = -5

2 (b+4) = -2

2b + 8 = -2

2b = -10

b = -5

2 (4x-5) = 7x - 5

8x - 10 = 7x - 5

x = -5 + 10

x = 5