Réponses

2014-04-29T11:54:47+02:00
2x-3 = 6
2x-3+3 = 6+3
2x = 9
x = 9/2
x = 4,5

9x+3 = 7x-5
9x-7x+3-3 = 7x-7x-5-3
2x = -8
x = -8/2
x = -4
2014-04-29T11:56:02+02:00
Bonjour

2x-3= 6
2x= 6+3
2x = 9
x = 9/2

 9x+3=7x-5

9x -7x = -5 -3
2x = -8
x = -8/2 = -4