To simplify the expression, you would typically need to know the expression you're working with. Since it seems you've omitted it, I can't provide the simplified result directly.
However, if you are looking for which of the given options is a simplified expression based on a mathematical operation (such as factoring, combining like terms, etc.), I would need more context.
Assuming you are asking for simplification of options themselves:
- −3x−5 is already in simplest form.
- 5x−5 can also be considered in simplest form.
- −3x−9 can be factored as -3(x + 3) if that is needed.
- −5x−9 is in simplest form.
If you have a specific expression you'd like simplified or need further clarification, please provide it!