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Sagot :

Bonjour,

Résoudre l'équation :

5(4-x) = 5

5 * 4 + 5 * (-x)  = 5

20 - 5x = 5

20 - 5x - 5 = 5 - 5

15 - 5x = 0

15 - 5x + 5x = 0 + 5x

5x = 15

5x/5 = 15/5

x = 3

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