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1+2-3-4+5+6-7-8........+2005+2006-2007
1+2-3-4+5+6-7-8........+2005+2006-2007
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=(1+2-3-4)+(5+6-7-8)+(....)....(+2005+2006-2007)
=(-4)+(-4)+(.....)+.......+(2004)
=-4(501)+2004
=-2004+2004
=0