Respostas

2014-06-08T23:20:13-03:00
2x+4-x=-x+4
2x-x+x=4-4
3x-x=0
2x=0
X=0/2
X=0
2014-06-09T00:00:34-03:00
2x + 4 - x = - x + 4
2x - x + x = +4 - 4
2x = 0
x = 0