Помогите решить : 4-1 5/12;6 7/15-2 11/15;9 2/21-5 9/21;11-3 5/12;7 3/20-2 9/20;6 7/16-2 11/16;9-5 7/15;8 3/17-3 5/17;10 3/16-3 9/16=?

4-1 5/12=3 12/12-1 5/12= 2 7/12 6 7/15-2 11/15= 5 22/15-2 11/15= 3 11/15;9 2/21-5 9/21= 8 23/21-5 9/21= 3 14/21= 3 2/3;11-3 5/12= 10 12/12-3 5/12= 7 7/12;7 3/20-2 9/20= 6 23/20-2 9/20= 4 14/20= 4 7/10;6 7/16-2 11/16= 5 23/16-2 11/16= 3 12/16= 3 3/4;9-5 7/15= 8 15/15-5 7/15= 3 8/15;8 3/17-3 5/17= 7 20/17-3 5/17= 4 15/17;10 3/16-3 9/16= 9 19/16-3 9/16= 6 10/16= 6 5/8