Réponses

2013-05-07T18:51:56+02:00

2x - 3 = 6

2x - 3 + 3 = 6 + 3

2x / 2 = 9/2

x = 4,5

 

9x + 3 = 7x - 5

9x + 3 - 3 = 7x - 5 - 3

9x - 7x = 7x - 8 - 7x

2x / 2 = -8 / 2

x = -4

 

Il suffit de regrouper les x ensemble et le reste ensemble