Answer:
The explanation is given below:
Explanation:
The computation is shown below:
If we add 7 and 2 then it provides 9 and then subtract 2 from 9 it provides 7 and then subtract 7 from 9 it provides 2 and like this way it follows for others two 
7 + 2 = 9 
9 - 2 = 7 
9 - 7 = 2
 
 8 - 3 = 5 
5 + 3 = 8 
8 - 5 = 3 
 
3 + 7 = 10 
10 - 7 = 3 
10 - 3 = 7