Bonjour

x

x - 4

- 3 ( x - 4 ) = - 3 x + 12

- 3 x + 12 - 3

= - 3 x + 9

en prenant 2 = - 6 + 9 = 3

- 3 x + 9 = 2

- 3 x = 2 - 9

- 3 x = -  7

x = 7/3

il faut choisir 7 /3

7/3 - 4 = 7/3 - 12/3 = - 5 /3

- 3 * - 5/3 = 15/3 = 5

5 - 3 = 2