Respostas

2014-08-22T15:25:08-03:00
3x-(x+1)=-x+1
3x-x+1=-x+1
2x+1=-x+1
2x+1+x-1=0
3x=0
x=0
2014-08-23T01:52:40-03:00
3x - ( x + 1 ) = - x + 1

3x - x + 1 = - x + 1

3x - x + x = 1 - 1

3x = 0

x = 0/3

x = 0