Answer:
-5? (negative five)
Explanation:
i'm not sure, i'm not in the same grade level as you, but i tried my best
I saw a problem similar as this but it was subtraction instead of addition, and the answer for the problem was 5, so if this problem was subtraction, the answer has to be the negative of the number five, so that's how i came up with the answer, negative 5
Hope i am correct!