5 1/84+31/63-(2 31/252+3 5/21))*(24+(1 1/2+4 3/8))=
1) 2 31/252+3 5/21=5 31/252+60/252=5 91//252
2) 5 1/84+31/63=5 3/252+124/252=5 127/252
3)5 127/252-5 91/252=36/252=18/126=9/63=1/7
4)1 1/2+4 3/8=5 4/8+3/8=5 7/8
5)24+5 7/8=29 7/8
6) 1/7*29 7/8=1/7*79/8=
36/252*29 7/8=36/252*7/232=36/36*1/232=1/232