(12-3 5/36)-(2 5/72-11/18)

12-3 5/36=11 36/36-3 5/36=8 31/36

2 5/72-11/18=1 77/72-44/72=
=1 33/72=1 11/24

8 31/36-1 11/24=
=8 62/72-1 33/72=7 29/72