Réponses

2013-05-29T22:13:21+02:00

Bonsoir

 

7x -9 +2x -9x +22x = 3 -x +4x -9 +18x

31x -9x -9 = 22x -x -6

31x -9x -22x +x = -6 +9

32x - 31x = 3

x = 3

2013-05-29T22:28:02+02:00

7x-9+2x-9x+22x=3-x+4x-9+18x

22x -9 = 21x - 6

22x-21x = -6+9

x=3