(14289-в)*404=4242000
4242000\404 14289-в=10500 в=3789
(14289*404)-(404*в)=4242000
(14289*404)-(404*в)=4242000; 5772756-404в=4242000; -404в=4242000-5772756; -404в=-1530756; в=-1530756/(-404); в=3789