Respostas

2014-02-17T15:40:37-03:00
A)6x+9-4x+4=3
  6x-4x=3-4-9
 2x= -10
x= -10/2
x= -5

b)7x-7-2x+10=x-5
  7x-2x-x=-5-10+7
 4x= -8
x= -8/4
x= -2 


c)6-2x=3x-12+15
 -2x-3x=-12+15-6
-5x= 3
(-1)
5x= -3
x= -3/5
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