209+(320*х-411)=43800:100
209+(320*х-411)=438
320*х-411=438-209
320*х-411=229
320*х=229=411
320*х=640
х=640:320
х=2
209+(320*х-411)=43800:100
209+(320*х-411)=438
320*х-411=438-209
320*х-411=229
320*х=229=411
320*х=640
х=640:320
х=2