Bonsoir je suis en 3ème j'ai cette exercice à faire pour demain pourriez vous m'aider s'il vous plaît ?​

Bonjour,

- 3x + 5 = 8

- 3x = 8 - 5

- 3x = 3

x = - 3/3

x = - 1

- x/8 + 2 = - 5/3

- x/8 = - 5/3 - 2

- x/8 = - 5/3 - 6/3

- x/8 = - 11/3

- x = - 11/3 * 8

x = 88/3

3x - 1/4 = x/4 + 1

12x/4 - 1/4 = x/4 + 4/4

12x - x = 4 + 1

11x = 5

x = 5/11

12x - 6 = 4x + 4

12x - 4x = 4 + 6

8x = 10

x = 10/8

x = 5/4

9y + 1/4 = 1/2

9y = 1/2 - 1/4

9y = 2/4 - 1/4

9y = 1/4

y = 1/4 * 9

y = 1/36

2x - 1 = (x + 5) / 2

(4x - 2) / 2 = (x + 5) / 2

4x - 2 = x + 5

4x - x = 5 + 2

3x = 7

x = 7/3

7x + 10 = - 2x - 5

7x + 2x = - 5 - 10

9x = - 15

x = - 15/9

7 (x - 1) = - 3 (2x - 4)

7x - 7 = - 6x + 12

7x + 6x = 12 + 7

13x = 19

x = 19/13.