Respostas

2013-12-09T11:21:46-02:00
A) 2x/2 - x/2 = 2/2
2x - x = 2
x = 2

b) 3x/2 - 10x/2 = -14/2
3x - 10x = -14
-7x = -14 .(-1)
7x = 14
x = 14/7
x = 2

c) x/4 + 28/4 = 2x/4 + 20/4
x + 28 = 2x + 20
x - 2x = 20 - 28
-x = -8 .(-1)
x = 8