x+9=13 6x=30 5-x=0 5+6x=-11 7e 7-x=9 8x=4 4x+3=0 6-x=-2 x-7=-2 4x=0 3x-2=2=2 7x-2=0

x + 9 = 13
x = 13 - 9
x = 4

6x = 30
x = 30/6
x = 5

5 - x = 0
x = - 5

5 + 6x = - 11
6x = - 11 - 5
6x = - 16
x = - 16/6

7 - x = 9
- x = 9 - 7
x = - 2

8x = 4
x = 4/8
x = 0,5

4x + 3 = 0
4x = - 3
x = - 3/4
x = - 0,75

6 - x = - 2
- x = - 2 - 6
- x = - 8
x = 8

x - 7 = - 2
x = - 2 + 7
x = 5

4x = 0
x = 0/4
x = 0

7x - 2 = 0
7x = 2
x = 2/7

J'ai fait ce qui était compréhensible