Réponses

2014-04-23T21:16:24+02:00
(4x+5)-(2x-5)-2x= 4x 
4x+5-2x+5-2x = 4x
4x -4x +10 =4x
10 =4x
4x = 10
x = 10/4
x =5/2
2014-04-23T21:17:36+02:00