a) 6+ 2(x - 5) = 2(-x + 4) b) 2(4x + 1) + 3 = 3(5x - 2)​

Réponse:

a) distribuer

6 + 2x - 10 = 2 ( - x + 4 )

-4 + 2x = 2 ( - x + 4 )

- 4 + 2x = 2 ( - x ) + 8

- 4 + 2x - 2 ( - x ) = 8

- 4 + 2x - 2 ( - 1 ) x = 8

- 4 + 2x + 2x = 8

- 4 + 4x = 8

4x = 8 + 4

4x = 12

x = 12/4

x = 3

b) distribuer

8x + 2 + 3 = 3 ( 5x - 2 )

8x + 5 = 3 ( 5x - 2 )

8x + 5 = 15x - 6

8x + 5 - 15x = - 6

- 7x + 5 = - 6

- 7x = - 6 - 5

- 7x = - 11

x = - 11/- 7

x = 11/7