Respostas

2014-08-13T22:38:38-03:00
Olá, Heliogomes!

- x - 5+4x = -7x + 6x + 15
- x + 4x + 7x - 6x = 15 + 5
3x + x = 20
4x = 20
x = 20 / 4
x = 5
2014-08-13T22:46:25-03:00
-x+4x+7x-6x=15+5 => 3x+x=20 => 4x=20 => x=20/4 => x=5