Explications étape par étape:
1a x = - 15
1b. x = - 15
1c. x = 15
1d. x = 5
1e. x = 14
1e. x = - 6
2a x = 0
2b x = 7/8
2c. x = - 3
2d. x = 2
2e. x = 5
3a. x = - 8/ 5
3b. x = 5
3c. x = 5/3
3d. x = 9/4
3e. x = 5/4
3f. x = 8
3g x = - 1
4a x = 0
4b. x = 3/5
4c. x = 0
4d. x = - 5/3
4e. x = - 1/2
4f. x = - 23/5
5 a. x = 20/3
5b. x = 18
5c. x = - 52/27
5d. x = 31/308
5e. x = 147/20