3x + 5 = -2x - 5 , -2x + 12 = x + 3 vérifier si la solution est 3 pareil pour -2 ; 7x + 5 = 4x + 8 , 3x-5 = x + 1 , - 11 + 3 = -5x + 5 , 3x -5 = 3x + 1 résoudre ses équations , aidez moi SVp
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3 x + 5 = - 2 x - 5
3 x + 2 x = - 5 - 5
5 x = - 10
x = - 10/5 = - 2
- 2 x + 12 = x + 3
- 2 x - x = 3 - 12
- 3 x = - 9
x = 3
7 x + 5 = 4 x + 8
7 x - 4 x = 8 - 5
3 x = 3
x = 1
3 x - 5 = x + 1
3 x - x = 1 + 5
2 x = 6
x = 6/2 = 3
- 11 + 3 = - 5 x ⇒ manque un x quelque part
3 x - 5 = 3 x + 1
3 x - 3 x = 1 + 5
0 x = 6 ⇒pas de solution