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Sagot :

Bonjour,

-6+14 = -16  --> Il manque l'inconnue

5(3x-3)+21 = -24

15x - 15 + 21 = - 24

15x = - 24 - 21 + 15

15x = - 30

x = - 30/15

x = - 2

4 (x+12)-3(x+12)=12

4x + 48 - 3x - 36 = 12

4x - 3x = 12 + 36 - 48

x = 0

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