Respostas

2013-11-19T08:56:34-02:00
A) x=8/2 
x=4
b) x= -20/4 
x=-5
c) 2x=27-3
2x=24
x=12
d) 4x - 2x = 20 - 2
2x = 18
x= 9
e) 3x + x = 15 - 5
4x = 10
x= 2,5
f) - 2x + x= -20 +10
- x = - 10
x=10