Réponses

2014-09-17T21:43:33+02:00
3x + 6 = 2x - 7
3x + 6 - 2x = 2x - 7 - 2x
1x + 6 = 7
1x + 6 - 6 = 7 - 6
1x = 1
1x/1 = 1