Respostas

2014-05-07T18:54:44-03:00
-4x=9-4
-4x=5(-1)
4x=-5
x=-5/4
2014-05-07T18:55:57-03:00
-4x+4=9
-4x=9-4
-4x=5
-x=5/4
- x= 1,25
x= 1, 25