Respostas

2014-07-16T10:05:30-03:00
2x-7=29
2x=29-7
2x=22
x=22 dividido por 2 = 11

2014-07-16T10:09:34-03:00
2x-7=29
2X=7+29
2X=36
36/2 
= 18