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Sagot :

Réponse:

3X - 9 = 5 - 4X

Pour X = 2, on a :

3 * 2 - 9 = 5 - 4 * 2

6 - 9 = 5 - 8

-3 = -3

Ensuite:

5X - 7 = 13

=> 5X = 13 + 7

=> 5X = 20

=> X = 20/5

Donc X = 4

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