Respostas

2014-09-02T23:40:30-03:00
2x + 4x = 3 - 9
6x= -6
x = -6 / 6
x= -1
1 5 1
2014-09-02T23:58:02-03:00


(2x+3)-(4X-9)

8X-18X+12X-27

8X-30X-27