Respostas

2014-04-08T19:23:14-03:00
A) x + 12 = 2x - 5
x - 2x = -5 -12
-x = -17 .(-1)
x = 17
1 5 1
2014-04-08T19:24:13-03:00
X + 12 = 2x - 5
x - 2x = -5 - 12
-x = -17                  .(-1)
x = 17

2 5 2