Résoudre : 32x + 87 = 56x - 105

32x+87=56x-105
⇔56x-32x=87+105
⇔24x=192
⇔x=8

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