Respostas

2014-07-27T12:07:29-03:00
9x - 24 = 2x + 4
9x -2x = 24 +4
7x = 28
x =28/7 = 4
1 5 1
2014-07-27T13:18:15-03:00
9x-24= 2(x+2)
9x-24=2x+4
9x-2x=4+24
7x=28 
x=28/7
x=4