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Sagot :

2 x 3b =5b / 2 x 7 = 14
Ca donne pour l’instant 5b + 14
4 x -2b = 8b / 4 x 1 = 4
5b + 14 = 8b + 4

5b + 14 - 14 = 8b +4 - 14
=
5b = 8b -10
5b - 8b = 8b - 8b -10
-3b = -10
b = -10/-3

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