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Explications étape par étape:

1) x = 7/3. x = 0

2) x = - 5 x = 0

3) x = 2 x = 1/8

4) x = 3/5 x = - 3/5

5) x = 3. x = - 11

6) x = - 1/11. x = 7/13

7) x = 1/4. x = 1

8) x = 12/7. x = 3/2