Do you mean possible? If so -0 is not possible. 0 means there is no amount of something there. For this answer it would be a negative number.
I think an aditional note I could leave here is that a number on inherates a negative if it lies on the left side of a number -0 in this problem algbraicly 9 would be the negative number -9 in this prblem
it would be 0 + -9 and like ILP said this woul lead to a negative number which in turn is -9
um no I what to no if 0 can be -.