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Sagot :

Réponse:

A = 5x - 3 + 2x - 9

7x - 3 - 9

7x - 12

B = - 2x + 5 + 8 - x

- 3x + 13

C = 12 - 3x - 5x - 7

12 - 8x - 7

5 - 8x

D = 10x - 4x - 1 - 6x - 2

6x - 1 - 6x - 2

- 1 - 2

- 3

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