Respostas

2014-02-19T12:33:15-03:00
Resposta

B

4x + 8 - 2x = x + 9 - 10
2x - x = 9 - 10 - 8
x = -10

C

x / 2 + x /3 = x + 9 /2

3x + 2x /6 = x + 9 /2

5x /6 = x + 9 /2

2. 5x = 6.(x + 9)
10x = 6x + 54
10x - 6x = 54
4x = 54
x = 54/4
x = 13,5