Respuestas

2013-01-08T21:47:37+01:00

-3x-[-6x-3+x]=9+x-1
-3x+5x+3 = 9 +x-1
2x+3 = 8 +x
X = 5  

2013-01-08T21:48:03+01:00

-3x-[-6x-(3-x)]=9+(x-1)

-3X+6X+3-X=X+8

      2X+3=X+8

        X=5