6+59+598+5998111000—(99998+997)—996
=6+60-1+600-2+5998111000-100000+2-1000+3-1000+4
=6-1-2+2+3+4+60+600+5998111000-100000-1000-1000
=12+660+5998010000-1000
=672+5998009000
=5998009672