Respostas

2014-07-28T20:26:33-03:00
2x-3x=2x-1
2x-3x-2x=-1
-3x=-1. (-1)
3x=1
x=1/3
2014-07-28T20:48:41-03:00
2x-3x=2x-1 portanto 
 -1x=1x
   x=0
ou
2x-3=2x-1
2x=+3-2x+1
2x=-1+1
2x=-2
x=2-2
x=0