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
