1.
An expression of the form 

 is called a "compound fraction" 
Compound fractions can be written as simple fractions by multiplying c to a, and then adding the product to c as follows:

for example, 

 can be written as: 

2.
when we subtract or add a fraction 

 from an integer k, 
we first write k as a fraction with denominator n. We can do this as follows:

for example, if we want to subtract 

 from 8, 
we first write 8 as a fraction with denominator 2:

3.
Thus, 

4.
The simple fraction 7/2 is not an option, so we write it as a compound fraction as follows:

(So write 7 as the sum of the largest multiple of 2, smaller than 7 + what is left. In our case these numbers are 6 and 1, then proceed as shown)
5. Answer: D