Respostas

2013-08-24T19:40:36-03:00
 x - 6x + 9 =
 -5x + 9 =
 x = 9/5 = 1,8
2013-08-25T10:44:39-03:00
X-6x+9=0
x-6x=-9
-5x=-9 (-1)
x=9/5
x=1,8