а)(х-11 5/16)+7 3/16=8 1/16+4 9/16
(х-11 5/16)=12 10/16-7 3/16
(х-11 5/16)=5 7/16
х=5 7/16+11 5/16
х=16 12/16
(16 12/16-11 5/16)+7 3/16=8 1/16+4 9/16
12 10/16=12 10/16
в)15 3/28 - (4 11/28+у)=7-1 9/28
15 3/28 - (4 11/28+у)=5 19/28
(4 11/28+у)=15 3/28-5 19/28
4 11/28+у=9 12/28
y=9 12/28- 4 11/28
y=5 1/28
15 3/28 - (4 11/28+5 1/28)=7-1 9/28
5 19/28=5 19/28