Definitions above considered, you cannot have less than x.
Definitions above considered, you cannot have more than y.
How can one make a claim that a number less than x may exist by deny a claim that a number greater than y may exist?
If a number is less than x it would be -y because it is given that all numbers less than x are the negative counterpart of a number of equal magnitude that is greater than x.
If a number is greater than y it would be -x because it is given that all numbers greater than y are the negative counterpart of a number of equal magnitude that is greater than y.