In order to find the equivalent expression, let's use the following property:

In other words, when subtracting a negative number, we can just add the corresponding positive number, that is, switch the two negative signs for a positive sign.
So we have that:

Therefore the correct option is D.
I would multiply 4/7 by 5 and 3/5 by 7 to get 20/35 and 21/35. The Least Common factor is 35
Answer:
30 is the total number..p