On the Subject of Entry Number One

Yes, this really is the same module, but with flipped numbers.

Number 2 - Number 1 + Number 3 = Solution
(assuming the numbers are read top-to-bottom).

If the solution is greater than 8 digits, modulo 100,000,000.

If the solution is less than 0, add 100,000,000 until it is not.

Submit the 8-digit number.