Explications étape par étape:
série 1
6x + 1 = - 11. x = - 2
105 = - 25x + 30. x. = - 3
- 8x + 7 = - 49. x = 7
- 9 - 8x = 15. x = - 3
série 2
2x + 5 = 15 - 3x. x = 2
- 6x + 4 = - 1 - x. x = 1
7x + 10 = x - 8. x = - 3
- 12x = 4 - 13x. x = 4
3x - 7 = 2x + 9. x = 16
série 3
32 - 5x = - 18 + 10x x = 10/3
7x = 4 ( x - 8 ) + 2x. x = - 32
13x - 3 ( 2x - 15 ) = 7x.
3/5x + 2 = 2x + 4/3. x = 10/21
