Sagot :
bonjour,
5 x + 2 = 2 x + 6
5 x - 2 x = 6 - 2
3 x = 4
x = 4/3
6 x + 6 = - 2 x + 14
6 x + 2 x = 14 - 6
8 x = 8
x = 1
- 12 x - 9 = 2 x + 6
- 12 x - 2 x = 6 + 9
- 14 x = 15
x = - 15/14
( x + 3 ) / 3 = ( 2 x + 1 ) / 4
4 x + 12 = 6 x + 3
4 x - 6 x = 3 - 12
- 2 x = - 9
x = 9/2
( 2 x - 3) / 3 = - 5 x + 1
2 x - 3 = - 15 x + 3
2 x + 15 x = 3 + 3
17 x = 6
x = 6/17
( 3 - 4 x ) /5 = ( 2 x + 1 ) / 4
12 - 16 x = 10 x + 5
- 16 x - 10 x = 5 - 12
- 26 x = - 7
x = 7/26