Sagot :
bonjour
-7x=2(x+4)
- 7 x = 2 x + 8
- 7 x - 2 x = 8
- 9 x = 8
x = - 8/9
5(x-3)=28
5 x - 15 = 28
5 x = 28 + 15
5 x = 43
x = 43/5
-2z+15=4z+2
- 2 z - 4 z = 2 - 15
- 6 z = - 13
z = 13/6
Réponse : Voilà, bonne journée
-7x = 2x +8
-7x - 2x = 8
-9x = 8
x = -8/9
5x - 15 = 28
5x = 28+15
5x = 43
x = 43/5
x = 8.6
-2z - 4z = 2 -15
-6z = -13
z = 13/6
Explications étape par étape :