Respostas

2013-12-09T20:10:48-02:00
A)2x+10=20

2x+10=20
2x=20-10
2x=10
x=10/2
x=5

b)3x-12=24

3x-12=24
3x=24+12
3x=36
x=36/2
x=18

c)2x-6=8

2x-6=8
2x=8+6
2x=14
x=14/2
x=7

d)x+10=28

x+10=28
1x=28-10
1x=18
x=18/1
x=18

e)2x-12=-30

2x-12=-30
2x=-30+12
2x=-18
x=-18/2
x=-9
Camila, reveja sua última questão :)
n da pra editar +
2013-12-09T20:17:55-02:00
a)
2x+10=20
2x=20-10
x=10/2
x=5

b)
3x-12=24
3x=24+12
3x=36
x=36/3
x=12

c)
2x-6=8
2x=8+6
2x=14
x=7

d)
x+10=28
x=28-10
x=18

e)
2x-12=-30
2x= -30+12
2x= -18
x= -18/2
x= -9