Respostas

2013-12-17T13:58:29-02:00

a)
3x - 4 = 12
3x = 12 + 4
3x = 16
x = 16 ÷ 3
x = 16/3

b)
19 = 4x - 1
- 4x = - 1 - 19
- 4x = - 20
x = - 20 ÷ (- 4)
x = 5
2013-12-17T14:30:54-02:00