3 or null, dude. im pretty sure. anything that can be divided by 9, can also be divided by 3. For ex.) 27/9 = 3 and 27/3 = 9.
you can't just throw a negative in the middle of a big number, that wouldn't make sense. so the answer is 3... pretty sure.
(sorry if it's wrong it's 3AM, im tired, but im trying my best to answer questions rn)