Réponses

2014-04-07T18:50:20+02:00
Salut :)

4x + 21 = 39
4x = 39 - 21
4x = 18
x = 18/4
x = 9/2
x = 4.5

J'espère t'avoir aidé(e) ! :)

2014-04-07T18:50:21+02:00
4x + 21 = 39
4x + 21 - 21 = 39 - 21
4x = 18
4x : 4 = 18 : 4
x = 4, 5