Réponse:
a. 5x-3 = 6-3x
5x+3x = 6+3
8x = 9
x = 9/8
b. 7-4x = 3+2x
- 4x-2x = 3-7
- 6x = - 4
x = - 4/-6
x = 4/6
c. 3 (5-2x) = 7-8x
15-6x = 7-8x
- 6x+8x = 7-15
2x = - 8
x = - 8/2
x = - 4
d. 3- (2x-4) = x+7
3-2x+4 = x+7
- 2x-x = 7-3-4
- 3x = 0 cette équation n'admet pas de solution
e. 3 (2x-7)-4 = 7-5 (4-3x)
6x-21-4 = 7-20+15x
6x-15x = 7-20+21+4
- 9x = 12
x = 12/-9
x = 4/-3
Bonjour !
a) 5x-3 = 6-3x
5x+3x = 6+3
8x = 9
x = 9/8
b) 7-4x = 3+2x
-4x-2x = 3-7
-6x = - 4
x = 4/6
x = 2/3
c) 3(5x-2) = 7-8x
15x-6 = 7-8x
15x+8x = 7+6
23x = 13
x = 13/23
d) 3-(2x-4) = x+7
3-2x+4 = x+7
-2x-x = 7-3
-3x = 4
x = -4/3
e) 3(2x-7) - 4 = 7-5(4-3x)
6x-21-4 = 7-20+15x
6x-15x = 7-20+21+4
-9x = 12
x = -12/9
x = - 4/3
Bonne courage.