Respostas

2013-12-11T11:33:51-02:00
5x-5=8+2
5x=8+2+5
5x=8+7
5x=15
x= \frac{15}{5}
x= 3
1 5 1
2013-12-11T12:39:43-02:00
5x - 5 = 8 + 2
5x = 8 + 2 + 5
5x = 15
x = 15 : 5
x = 3

(x - 1) = 4x + 9
x - 1 = 4x + 9
x - 4x = 9 + 1
- 3x = 10
x = 10 : (- 3)
x = - 10/ 3