Respostas

2014-04-24T14:23:30-03:00
X + x/5 = 2x - 30
x - 2x + x/5 = -30
-x + x/5 = -30
-5x/5 + x/5 = -30
-4x/5 = -30
-4x = -30.5
-4x = -150
x = -150/-4
x = 75/2