1-2/5=5/5-2/5=3/5
12-1/7=11 7/7-1/7=11 6/7
12-41/70=11 70/70-41/70=11 29/70
8 3/4-4=4 3/4
9 4/9-1/3=85/9-3/9=82/9=9 1/9
5 8/15-2 1/15=3 7/15
1 1/2-1/2=1
1 1/2-1/6=3/2-1/6=9/6-1/6=8/6=1 1/3
4 8/11-1 9/11=3 19/11-1 9/11=2 10/11
4 5/16-1 3/8=69/16-11/8=69/16-22/16=47/16=2 15/16