To simplify $x - 7$, it remains as $x - 7$, since there are no like terms to combine or further simplifications unless additional context is provided.

The correct response is not listed among the provided options, as none of the options accurately represent $x - 7$ in simplified form. If $x$ represents a variable and $-7$ a constant, their combination cannot be rewritten as one of the forms shown in your options.

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Do you have any follow-up questions or need more explanation?

Here are 5 questions related to this topic:

1. What does it mean to simplify an expression like $x - 7$?
2. How do constants and variables interact in expressions?
3. Can subtraction between variables and constants lead to division as shown in some of the options?
4. Why is combining like terms important in algebraic simplifications?
5. What are examples of simplifying other similar expressions, like $2x - 5$?

Tip: Always ensure like terms are combined when simplifying, but keep constants and variables separate unless specified otherwise.