Bonjour je doit faire l’exercice 28 et 30 de cette page ce serai possible que quelqu’un m’aide? Ps: je suis en 4e

Bonsoir,

28)

a. - 2 + x = 5

x = 5 + 2

x = 7

b. x + 9 = 16

x = 16 - 9

x = 7

c. 6x = 15

x = 15/6

x = 5/2

d. - 5x = 24

x = - 24/5

e. 4x + 3x = 49

7x = 49

x = 49/7

x = 7

f. - 2x + 7x = 36

5x = 36

x = 36/5

30)

a. 3/4x = 5

3/4x = 20/4

3x = 20

x = 20/3

b. 4x - 3 = 11

4x = 11 + 3

4x = 14

x = 14/4

x = 7/2

c. 7 - 8x = 56

- 8x = 56 - 7

- 7x = 49

x = - 49/7

x = - 7.