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bonjour

merci de mettre profil collège et non lycée

3 x + 4 = 20 x + 21

3 x - 20 x = 21 - 4

- 17 x = 17

x = - 1

Bonjour,

3x + 4 = 20x + 21

3x - 20x = 21 - 4

-17x = 17

x = -17/17 = -1

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