-3/5-1/5=-4/5

-1/3-2/3=-3/3=-1

-1/4-5/7=-4/28-20/28=-24/28=-6/7

-5/6-1/3=-5/6-2/6=-7/6=-1 1/6

-4 3/8-2 1/4=-4 3/8-2 2/8=-6 5/8

-6 1/2-3 5/7=-6 7/14-3 10/14=-9 17/14=-10 3/14

-3/7-4/7=-7/7=-1

-1/8-3/4=-1/8-6/8=-7/8