Answer:
X must be a number more than 3
X could be 5
Explanation:
If x was 5, -3+5 would equal 2. This is a positive number.
If we said that X was a negative number such as -4, it would not work because -3-4=-7. That means that X equals -7. This is not a valid answer as it is a negative number.
This was just a guess, please check.