Respostas

2014-03-02T20:23:40-03:00


7x  - 5 = 22 - 2 x

7x + 2x = 22 + 5

9x = 27

x = 27/9

x = 3

2014-03-02T20:39:24-03:00
7x-5=22-2x
7x+2x=22+5
9x=27
x=27/9
x=3