bonjour
3 x - 5 = 4 - x
3 x + x = 4 + 5
4 x = 9
x = 9/4
6 x = - 2 x + 9
6 x + 2 x = 9
8 x = 9
x = 9/8
2 x /3 - 1 = 4/9 + 2 x
6 x /9 - 9 /9 = 4/9 + 18x /9
6 x - 18 x = 4 + 9
- 12 x = 13
x = - 13/12
26 + x = 2 ( 11 + x )
26 + x = 22 + 2 x
x - 2 x = 22 - 26
- x = - 4
x = 4
dans 4 ans
x
3 x
3 x - 7
avec 2 on obtient : 6 - 7 = - 1
avec - 5 = - 15 - 7 = - 22
avec 13 = 26 - 7 = 19
3 x - 7 = 56
3 x = 56 + 7
3 x = 63
x = 63/3 = 21
3 x - 7 = 0
3 x = 7
x = 7/3
