(5 7/8-y)+4 3/8=7 1/8
(5 7/8-у)+4 3/8=7 1/8 (5 7/8-у)=7 1/8-4 3/8 5 7/8-у=-5/8 у= 5 7/8-(-5/8)=5 7/8+5/8= 6 4/8