Respostas

2014-03-03T14:29:34-03:00
A) x-3=0
x=3

b) x+12=0
x=-12

c) 4-x=0
-x=-4 (-1)
x=4

d) 3x + 18=0
3x=-18
x=-18/3
x=6

e) 4x-9=0
4x=9
x=4/9

f) 1/x+1=0
1/x=-1
1=-x (-1)
x=-1