Respostas

2014-03-11T12:14:51-03:00
2x - 4x = 1 - 55
- 2x= - 54 . (- 1)
x=54/2


2014-03-11T12:48:53-03:00

2x+55-4x-1x=0
-3x=-55(-1)
3x=55
x=55/3