с-529=18168-6250
с-529=11918
с=11918+529
с=12447
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с-529=18168-6250
с-529=11918
с=11918+529
с=12447
с-529=18168-6250
с-529=11918
с=11918+529
с=12447
___________________
(12447-529)+6250=18168
18168=18168