Respostas

2014-06-25T15:15:28-03:00
5x + 2x -4 = - 2x + 8 - 3x
7x - 4 = -5x + 8
Isolando a variavel com o  x temos 
7x +5x = 8 + 4
12 x = 12 
x = 1 
1 5 1
2014-06-25T15:53:57-03:00

5x + 2x -4 = - 2x + 8 - 3x

  5x + 2x + 2x + 3x = 8 + 4

12x = 12

X = 12/12

X = 1