Respostas

2013-06-16T12:00:39-03:00

a) 3x-6=-12

 

3x=6-12

 

x=-6/3

 

x= -2

 

b)10-(8x-2)=5x+ 2(-4x+1)

 

10-8x+2 = 5x-8x+2

 

-8x-5x+8x = 2-2-10

 

-5x = -10

 

x = -10/-5

 

x = 2

 

 

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