Bonjour, pouvez-vous m'aider je n'y arrive pas merci d'avance

Bonsoir,

4x + 8 = 12

4x = 12 - 8

4x = 4

x = 4/4

x = 1

=

3x + 5 = x + 7

3x - x = 7 - 5

2x = 2

x = 2/2

x = 1

x + 1 = 5x + 21

x - 5x = 21 - 1

- 4x = 20

x = - 20/4

x = - 5

=

6x - 9 = 10x + 11

6x - 10x = 11 + 9

- 4x = 20

x = - 20/4

x = - 5

8x - 4 = x - 3

8x - x = - 3 + 4

7x = 1

x = 1/7

=

4x - 5 = - 3x - 4

4x + 3x = - 4 + 5

7x = 1

x = 1/7

1/2x - 1 = 2x + 5

1/2x - 2x = 5 + 1

- 1,5x = 6

x = - 6/1,5

x = - 4

=

3x + 1 = 9 + 5x

3x - 5x = 9 - 1

- 2x = 8

x = - 8/2

x = - 4

4x - 3 = x - 7

4x - x = - 7 + 3

3x = - 4

x = - 4/3

=

1 - 6x = - 3/2x + 7

- 6x + 3/2x = 7 - 1

- 12/2x + 3/2x = 14/2 - 2/2

- 9/2x = 12/2

- 9x = 12

x = - 12/9

x = - 4/3