Réponse :
Explications étape par étape :
3x + 7 = 13
3x = 13 - 7
3x = 6
x = 6/3 = 2
2x - 9 = 7
2x = 7 + 9
2x = 16
x = 16/2 = 8
7x - 10 = 4
7x = 4 + 10
7x = 14
x = 14/7 = 2
2 = 6x + 13
2 - 13 = 6x
6x = - 11
x = - 11/6
- 5x - 3 = 12
- 5 x = 12 + 3
- 5x = 15
5x = -15
x = -15/5 = - 3
- 4 = 3x + 1
- 4 - 1 = 3x
3x = - 5
x = - 5/3
2x/7 - 1/4 = 5/4
2x/7 = 6/4
2x = 42/4
x= 42/8
x = 21/4
13 = -x + 4
x = 4 -13
x = - 9
- 2 - 9x = 11
- 2 - 11 = 9x
9x = - 13
x = - 13/9
5x/12 + 1/6 = -1/4
5x/12 = - 1/4 - 1/6
5x/12 = - 3/12 - 2/12
5x/12 = - 5/12
5x = - 5
x = -5/5 = -1
Bonne journée