10 3/4-3 5/6=10 9/12-3 10/12=9 21/12-3 10/12=
=6 11/12
проверка:6 11/12+3 5/6=6 11/12+3 10/12=
=9 21/12=10 9/12=10 3/4
10 3/4-5 3/4=5
10 3/4-7 5/8=10 6/8-7 5/8=3 1/8
10 3/4-4 2/3=10 9/12-4 8/12=6 1/12
10 3/4-9 5/8=10 6/8-9 5/8=1 1/8
10 3/4-6 11/12=10 9/12-6 11/12=9 21/12-6 11/12=
=3 10/12