Question

What is the answer to this problem. -9 - (-9)=?

Answer 1

Two negative = one positive

-9 - (-9) = -9 + 9 = 0

your answer is 0

hope this helps

Answer 2

When subtracting with a negative, your basically adding.

So then -9+9=0 (because y'know, you're subtracting a negative.