Réponse :
Explications étape par étape
Bjr,
2x 6+4=10
x= 10/2 = 5
7x = 2-3= -1
x = -1/7
4x-2x = 7+5
2x = 12
x= 12/2 =6
3x-2x+5x = 4-4+3
6x = 3
x= 3/6 =1/3
7x+4x -8x -3x = -4+2
0 = -2 : imposible, il y a une erreur
2x/3 = 4+3
2x/3 = 7
2x = 7*3= 21
x= 21/2
3x/5 -6x/5 = 4/9 +2/9
-3x/5 = 6/9 = 2/3
-3x = (2/3)5 = 10/3
x = (10/3 )/-3 = 10/3 * (-1/3) = -10/6 = -5/3
6x -8 = 28x +12
-8-12 = 28x -6x
-20 = 22x
-20/22 = -10/11 = x ☺
