8/15-7/15+y=14/15. 17/20-x=14/20-3/20
8/15 - 7/15 + у = 14/15 17/20 - х = 14/20 - 3/20 1/15 + у = 14/15 17/20 - х = 11/20 у = 14/15 - 1/15 х = 17/20 - 11/20 у = 13/15 х = 6/20 х = 3/10