3/4-5/16=12/16-5/16=(12-5)/16=7/16
3/10-1/5=3/10-2/10=(3-2)/10=1/10
2/3-5/9=6/9-5/9=(6-5)/9=1/9
1/2-1/4=2/4-1/4=(2-1)/4=1/4
3/7-5/14=6/14-5/14=(6-5)/14=1/14
2/5-1/20=8/20-1/20=(8-1)/20=7/20
3/4-5/16=12/16-5/16=(12-5)/16=7/16
3/10-1/5=3/10-2/10=(3-2)/10=1/10
2/3-5/9=6/9-5/9=(6-5)/9=1/9
1/2-1/4=2/4-1/4=(2-1)/4=1/4
3/7-5/14=6/14-5/14=(6-5)/14=1/14
2/5-1/20=8/20-1/20=(8-1)/20=7/20