Respostas

2014-06-02T15:03:15-03:00
2x+2=128
2x=126
x=68

7²x-4=49
49x=49+4
49x=53
x=53/49
x≡1,081

10x=1
x=1/10
x=0,1

16x=32
x=32/16
x=2

5x=1/125
x=1/25/5
x=0,0016

1/3x=1
x=3