4,31-х=5,18
х=4,31-5,18
х=-0,87
у+1 1/21= 2 11/14
у=2 11/14-1 1/21=39/14-22/21=(39*3-22*2)/42=73/42=1 31/42
у=1 31/42
4,31-х=5,18
х=4,31-5,18
х=-0,87
у+1 1/21= 2 11/14
у=2 11/14-1 1/21=39/14-22/21=(39*3-22*2)/42=73/42=1 31/42
у=1 31/42