Respostas

2014-05-05T19:13:49-03:00
2x - 4 = -x + 5
2x + x = 5 + 4 
3x = 9
x = 9/3
x = 3 
2014-05-05T19:14:59-03:00
2x - 4 = -x + 5
2x + x =5 +4
3x=9
x=9
   3
x=3