Respostas

2014-08-12T19:24:35-03:00
2x-4-8=4x
2x-4x=8
-2x=8 (-1)
2x=8
x= 8/2
x=4
9 4 9
2014-08-12T19:25:44-03:00
2x-4-8=4x
2x-4x=4+8
-2x=12
(-1) -2x=12 (-1)
2x=-12
x=-12/6
x=2
2 1 2