Bonjour, pouvez vous m’aidez svp?

Réponse :

Bonjour,

a. 7x - 4 = 5x + 6

7x - 5x = 6 + 4

2x = 10

x = 10/2

x = 5

b. 3 - 2x = -9 + 3x

-2x - 3x = -9 -3

-5x = -12

x = 12/5

c. 4,3x + 12 = 33 - 5,7x

4,3x + 5,7x = 33 - 12  

10x = 21

x = 21/10

x = 2,1

d. 3x - 2x + 8 = 5 + 4 - 8x

3x - 2x + 8x = 5 + 4 - 8

9x = 1

x = 1/9