Pouvez m’aider à l’exercice ci dessous svp.

Bonsoir,

a. x + 4 = 12

x = 12 - 4

x = 8

b. x + 5,1 = x + x

x - x - x = - 5,1

- x = - 5,1

x = 5,1

c. 6x = x - 15

6x - x = - 15

5x = - 15

x = - 15/5

x = - 3

d. - 14 = 2x

2x = - 14

x = - 14/2

x = - 7

e. 5 = 4x

4x = 5

x = 5/4

f. x + 8 = 2x + 3

x - 2x = 3 - 8

- x = - 5

x = 5.