Réponses

2014-02-12T18:29:03+01:00
6x-4 = 8x+7 : On sépare les "x" (sans oublier de changer de signe) :
6x - 8x = 7 + 4
- 2x = 11
x = - 11/2

1/2x + rac2 = 5/2x - 3rac2 : on isole les "x"
1/2x - 5/2x = -3rac2 - rac2
-4/2x = -4rac2
2x = 4rac2
x = 4rac/2
x = 2rac2