Respostas

2013-11-24T18:48:30-02:00
A) x + 4 = 10
x = 10 - 4
x = 6

b) 3x=12
x = 12/3
x = 4

c)6x = 2x + 28
6x - 2x = 28
4x = 28
x = 28/4
x = 7

d) 3(x + 2) = 15
3x + 6 = 15
3x = 15 - 6
3x = 9
x = 9/3
x = 3
1 5 1