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2010-03-27T16:18:52+01:00
-6x-4y-[-(6x-2y-3x+y)-4x+12+10y]=-6x-4y+6x+2y+3x-y+4x-12-10y=7x-13y-12
2010-03-27T16:19:04+01:00
-6x-4y-[-(6x-2y-3x+y)-4x+12+10y]=-6x-4y-[(-6x+2y+3x-y)-4x+12+10y]=
-6x-4y+6x-2y-3x+y+4x-12-10y= x-15y - 12
2010-03-27T16:19:13+01:00
=-6x-4y-[-(3x-y)-4x+12+10y]=
=-6x-4y-[-3x+y-4x+12+10y]=
=-6x-4y-(-7x+11y+12)=
=-6x-4y+7x-11y-12=
=x-15y-12.