Besoin d'aide::::MERCI:::::::::::Résoudre les équation suivantes:::::A = 17x - 8 = 7x - 2:::::::::::::: B = -4x - 21 = 3x + 7:::::::::::::::C = -3x + 11 = -8x -

A)
17x - 8 = 7x - 2
17x - 7x = - 2 + 8
10x = 6
x = 6/10
x = 3/5

B)
- 4x - 21 = 3x + 7
- 21 - 7 = 3x + 4x
- 28 = 7x
- 28/7 = x
- 4 = x

C)
- 3x + 11 = - 8x - 9
- 3x + 8x = - 9 - 11
5x = - 20
x = - 20/5
x = - 4

D)
7x + 3 = 9x - 7
3 + 7 = 9x - 7x
10 = 2x
10/2 = x
5 = x

A /
17x - 8 = 7x - 2
17x -7x  =  - 2 + 8
10x =  6
x= 6/10
x = 3/5


B/
-4x - 21 = 3x + 7
-4x -3x  =  7 + 21
-7x  =  28
x = - 28/7
x =  - 4


C/
-3x + 11 = -8x - 9
-3x +8x = - 9 - 11
5x = -20
x = -20/5
x = - 4


D/
7x + 3 = 9x - 7
7x - 9x  = - 7 -3
- 2x  = - 10
 x = 10 / 2
 x = 5