Solve.
7/8 – (1/4 + 1/2)
2/3 – 1/4 + 1/6
7/10 – (2/5 + 1/10)
7/8 – 1/4 + (1/2 – 1/8)
3/10 + 3/5 – 1/2
9/10 – (3/8 + 1/4)
39/10 – (23/8 + 1/4)
23/10 + 133/5 – 51/2
21/3 + (68/9 – 45/6)
21/3 + (108/9 – 65/6)
135/6 – 91/4 + 2/3
51/3 – 21/4 + 82/3
21/4 + (21/4 – 3/8)
51/6 + (71/4 – 25/8)
53/24 – (21/3 + 3/4)
1555/100 – 71/2 + 53/5