Bonjour, j’ai l’exercice 7 page 99 sesamath niveau 4* a faire mais je ne comprend pas. Aidez moi svp !

bonsoir

4 x - 12 = 0

4 x = 12

x = 3

4 x + 1 = 0

4 x = - 1

x = - 1/4

2 x - 3 = 0

2 x =  3

x = 3/ 2

2 - 3 x = 0

- 3 x = - 2

x = 2/3

ax + b = 0

ax = -  b

2 x + 8 = 0

2 x = - 8

x = - 4

2 -  7 x = 0

-  7 x = - 2

x = 2/7

3 x - 1 = 0

3 x =  1

x =  1/3

7 x + 8 = 0

7 x = - 8

x = - 8/ 7

allez termine