Respostas

2014-07-17T10:26:28-03:00
-(6y+4x)+(3y-4x)-(2x+3y) = -6y-4x+3y-4x-2x-3y-6y-10x
2014-07-17T10:32:15-03:00
-(6y+4x)+(3y-4x)-(2x+3y) =
 -6y-4x+3y-4x-2x-3y =
  
-6y-10x