One divided by two-fifths minus negative three-fifths.

In order to solve this problem correctly, we need to keep in mind the Order of Operations (PEMDAS).
PEMDAS says to do the division first.

now we subtract
from 2.5 (or, in fraction form,
)

Now, we can simplify this problem by remembering this: Subtracting a negative is the same as adding a positive.
So, we can rewrite it like this -

Then we also need to find the Least Common Denominator (LCD) of these two fractions before we can add them. I encourage you to figure this out yourself.

Now we add the numerators to get the answer.
so the solution is

Simplify

That is your final solution.
I hope you found this helpful!