Bonjours est ce que qlq peut m’aider pour l’exercice 1 svp ?? Merciii

Réponse:

Bonjour,

3x+7 = 0

3x = -7

x = -7/3

6-x = 4

-x = 4-6

-x = -2

x = 2

3(x+7) = x+1

3x+21 = x+1

3x-x = 1-21

2x = -20

x = -20/2

x = -10

3x+7 = x-1

3x-x = -1-7

2x = -8

x = -8/2

x = -4

6-x = x+14

-x-x = 14-6

-2x = 8

x = -8/2

x = -4

3(x+7) = 4x+9

3x+21 = 4x+9

3x-4x = 9-21

-x = -12

x = 12