Respostas

2013-10-03T10:56:04-03:00
4y + 2 = 2y - 18
4y - 2y = -18 - 2
2y = -20
y = -20/2
y = -10
1 5 1
2013-10-03T11:02:36-03:00
4y+2=2y-18
4y-2y=-18-2
2y=-20
y=-20/2
y=-10