Respostas

2014-05-26T15:06:44-03:00
Basta somar os termos semelhantes
-3x + 12x -8 + 12=0
9x + 4=0
9x=-4
x=-4/9

1 5 1
2014-05-26T15:11:10-03:00


-3x + 12x = +8 - 12

9x = -4

x = - 4/9

1 5 1