bonjour,

5

5 * 4 = 20

20 -14 = 6

6

12

12 * 4 = 48

48- 14 = 34

34

x

4 x

4 x - 14

4 x - 14 = 14

4 x = 14 + 14

4 x = 28

x = 7

jules a choisi  7