26 176:(у*56-45 856)=409
у*56-45 856=26 176:409
у*56-45 856=64
у*56=64+45 856
у*56=45 920
у=45 920:56
у=820
26 176:(у*56-45 856)=409
у*56-45 856=26 176:409
у*56-45 856=64
у*56=64+45 856
у*56=45 920
у=45 920:56
у=820