Respostas

2014-03-13T15:15:40-03:00
5x + 8 = 10x + 20
5x - 10x = 20 - 8
-5x = 12
 x = 12/-5
  x = 2,4
2014-03-13T15:17:24-03:00
5x+8=10x+20
5x-10x=20-8
5x=12
12/5
x=2