Respostas

2014-03-06T16:40:30-03:00
-5x+10(x+4)=6x+38
-5x+10x+40=6x+38
5x+40=6x=38
5x-6x=38-40
-x=-2
x=2

2 4 2
2014-03-06T16:40:40-03:00
5 [- x + 2 (x + 4)] = 2 (3x + 19)
5 [- x + 2x + 8] = 6x + 38
- 5x + 10x + 40 = 6x + 38
- 5x + 10x - 6x = 38 - 40
- x = - 2
x = - 2 
÷ (- 1)
x = 2