Respostas

2013-10-06T14:42:37-03:00
-x + 4x + 7x - 6x = 15 + 5
4x = 20
x = 20/4
x = 5
  • Usuário do Brainly
2013-10-06T14:44:00-03:00
- x - 5 + 4x = - 7x + 6x + 15
3x - 6x + 7x = 15 + 5
- 3x + 7x = 20
4x = 20
x = 20/4
x = 5