3/4-1/8=6/8-1/8=5/8
1/5+1/6=6/30+5/30=11/30
4/15+2/5=4/15+6/15=10/15=2/3
7/10-1/2=7/10-5/10=2/10=1/5
1/3-1/4=4/12-3/12=1/12
1/2+2/7=7/14+4/14=11/14
1/2-1/3=3/6-2/6=1/6
3/4+1/8=6/8+1/8=7/8
5/6-7/12=10/12-7/12=3/12=1/4
2/5+3/10=4/10+3/10=7/10
5/9+7/15=25/45+21/45=46/45= 1 1/45
3/8+19/56=21/56+19/56=40/56=5/7
19/45-7/18=38/90-35/90=3/90=1/30
1/4-1/8=2/8-1/8=1/8
11/14+8/21=33/42+16/42=49/42=7/6= 1 1/6