3/8+7/10+5/8=17/10
7/8-(1/8+3/4)=0
4/7+1/6-4/7=1/6
2-7/9-2/9=1
3/5+7/8+2/5=15/8
7/9-(1/9+1/3)=1/3
1/4+(2/5+3/4)=7/5
5/6-3/10+1/6-7/10=0
3/4+1/6-2/3=1/4
7/8-1/4+4/9=77/72
1-1/3+2/7=20/21
1/2+4/5-3/10=1
5/6-(2/3-1/9)=5/18
9/10-(3/4+1/8)=1/40
1/2+2/3-3/4=5/12
