Respostas

2013-07-07T17:26:28-03:00
A)2.(7-a)= -2a+14
-2a+14=0
-2a=-14
a=7

B)5(2x+4)=10x+20
10x+20=0
10x=-20
x=-2

C)-6(x+y)= -6x-6y
-6x-6y=0
-6x=6y
-x=y
x=-y
1 5 1
2013-07-07T18:34:42-03:00
A. 2.(7-a)= 14-2a
b.5.(2x+4)=10x+20
c.-6.(x+y)=-6x-6y