(31 23/60-4 4/ 67/72-18 1/6+19/23)-1/36-(3+18 1/4)=

(31 23/60-4 4/5)-(18 67/72-18 1/6+19/23)-1/36-(3+18 1/4)=3 395/552
1) 31 23/60-4 4/5=26 7/12
2) 18 67/72-18 1/6=55/72
3) 55/72+19/23=1 977/1656
4) 3+18 1/4=21 1/4
5)26 7/12-1 977/1655=24 1645/1656
6) 24 1645/1656-1/36=24 533/552
7) 24 533/552-21 1/4=3 395/552