Sagot :
Bonjour,
5x + 12 = 3
5x = 3 - 12
5x = - 9
x = - 9/5
10x + 1 = -7
10x = - 7 - 1
10x = -8
x = -8/10 = -4/5
9x - 2 = 6
9x = 6 + 2
9x = 8
x = 8/9
20 - 4x = - 4
- 4x = - 4 - 20
- 4x = - 24
x = -24/-4 = 24/4 = 6
2x = -2x + 8
2x + 2x = 8
4x = 8
x = 8/4 = 2
4x - 8 = 7x + 4
4x - 7x = 4 + 8
- 3x = 12
x = 12/-3 = -4
3x + 5 = 6x - 9
3x - 6x= - 9 - 5
- 3x = -14
x = -14/-3 = 14/3
Bonne journée !
bonjour
on laisse les x d'un côté du signe = et les constantes de l'autre
5 x + 12 = 3
5 x = 3 - 12
5 x = - 9
x = - 9/5
10 x + 1 = - 7
10 x = - 7 - 1
10 x = - 8
x = - 8/10 = - 4/5
9 x - 2 = 6
9 x = 6 + 2
9 x = 8
x = 8/9
20 - 4 x = - 4
- 4 x = - 4 - 20
- 4 x = - 24
x = 6
2 x = - 2 x + 8
2 x + 2 x = 8
4 x = 8
x = 8/4 = 2
4 x - 8 = 7 x + 4
4 x - 7 x = 4 + 8
- 3 x = 12
x = - 12/3 = - 4
3 x + 5 = 6 x - 9
3 x - 6 x = - 9 - 5
- 3 x = - 14
x = 14/3