Réponses

2014-05-26T15:16:32+02:00
2014-05-26T15:18:46+02:00
32x + 87 = 56x -105
32x -32x +87 =  56x -32x -105
87 = 24x -105
87+105 = 24x+105-105
24x = 192
x = 192/24
x = 8