Réponses

2013-04-28T19:16:22+02:00

Il faut développer.

-3(-a + 3) = 5(3 - a) + 2

3a - 9 = 15 - 5a + 2

3a - 9 + 9 = 17 - 5a + 9

3a + 5a = 26 - 5a + 5a

8a / 8 = 26 / 8

a = 26/8

2013-04-28T19:20:01+02:00