TRAVAIL FACILE : résoudre les équations suivantes : .3x+12=0 .4x-12=6 .-5x+10= -5 . 3x+2,4=7,5 .10-4x=0 .8-3x=5

3x + 12 = 0
3x = - 12
x = - 12/3
x = - 4

4x - 12 = 6
4x = 6 + 12
4x = 18
x = 18/4
x = 9/2

- 5x + 10 = - 5
- 5x = - 5 - 10
- 5x = - 15
x = - 15/-5
x = 3

3x + 2,4 = 7,5
3x = 7,5 - 2,4
3x = 5,1
x = 5,1/3
x = 1,7

10 - 4x = 0
10 = 4x
10/4 = x
5/2 = x

8 - 3x = 5
8 - 5 = 3x
3 = 3x
3/3 = x
1 = x

Salut !

[tex]3x+12 = 0 \\ 3x = -12 \\ x = \frac{-12}{3} \\ \\ x =-4 \\ \\ 4x-12=6 \\ 4x = 18 \\ x = \frac{18}{4} \\ \\ x=\frac{9}{2} [/tex]

[tex]-5x+10 = -5 \\ -5x = -15 \\ x = \frac{-15}{-5} \\ \\ x = 3 \\ \\ 3x+2.4 = 7.5 \\ 3x = 5.1 \\ x = \frac{5.1}{3} \\ \\ x = 1.7[/tex]

[tex]10-4x=0 \\ -4x=-10 \\ x = \frac{-10}{-4} \\ \\ x = \frac{5}{2} \\ \\ 8-3x=5 \\ -3x=-3 \\ x = \frac{-3}{-3} \\ \\ x=1 [/tex]

J'espère t'avoir aidé(e) ! :)