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Sagot :

Réponse :

2x = 26

x = 26/2 = 13

3-2+4x=12

1+4x=12

4x=12-1

4x=11

x= 11/4

-8+3+6-x=24

5+6-x=24

-x=24-5-6

-x = 13

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