adding fractions
3/10+5/10
4/5
7/8-3/8
1/2
-6/11*4/-3
8/11
(2/3)/(1/2)
7+2/3
23/3
12-8/5
52/5
24*-5/9
-40/3
5/(5/6)
6
- 9/10+12/5
3/2
-3/8-5/12
-19/24
1/2*9
9/2
(8/3)/4
2/3
3/8+3/5
39/40
1/3-8/9
-5/9
7/24*9/14
3/16
(20/21)/(5/7)
4/3