Bonjour , pouvez vous m'aidez pour ce travail de troisième svp il faut résoudre chaque équations svp merci

Bonjour,

5x + 12 = 3

5x = 3 - 12

5x = - 9

x = - 9/5

10x + 1 = -7

10x = - 7 - 1

10x = -8

x = -8/10 = -4/5

9x - 2 = 6

9x = 6 + 2

9x = 8

x = 8/9

20 - 4x = - 4

- 4x = - 4 - 20

- 4x = - 24

x = -24/-4 = 24/4 = 6

2x = -2x + 8

2x + 2x = 8

4x = 8

x = 8/4 = 2

4x - 8 = 7x + 4

4x - 7x = 4 + 8

- 3x = 12

x = 12/-3 = -4

3x + 5 = 6x - 9

3x - 6x=  - 9 - 5

- 3x = -14

x = -14/-3 = 14/3

Bonne journée !

bonjour

on laisse les x d'un côté du signe =  et les constantes de l'autre

5 x + 12 = 3

5 x = 3 - 12

5 x = - 9

x = - 9/5

10 x + 1 = - 7

10 x = - 7 - 1

10 x = - 8

x = - 8/10 = - 4/5

9 x - 2 = 6

9 x = 6  + 2

9 x = 8

x = 8/9

20 - 4 x = - 4

- 4 x = - 4 - 20

- 4 x = - 24

x = 6

2 x = - 2 x + 8

2 x + 2 x = 8

4 x = 8

x = 8/4 = 2

4 x - 8 = 7 x + 4

4 x - 7 x = 4 + 8

- 3 x = 12

x = - 12/3 = - 4

3 x + 5 = 6 x - 9

3 x - 6 x = - 9 - 5

- 3 x = - 14

x = 14/3