4 - 2 + 6 - 5 - 2 =

(a)  

2 - 2 + 1 + 7 - 8 =

(a)  

6 - 1 + 4 - 7 + 5 =

(a)  

1 + 3 - 3 + 1 + 7 =

(a)  

8 - 7 + 6 - 1 + 3 =

(a)  

2 + 2 - 1 + 1 - 2 =

(a)  

3 - 1 + 6 - 8 + 5 =

(a)  

7 - 5 + 5 - 5 + 6 =

(a)  

9 - 7 - 2 + 7 + 2 =

(a)