It seems like you're providing the expression $x - 9$. Do you want to simplify, solve, or manipulate this expression in any particular way?

Here are some possibilities:

1. If you want to solve for $x$, you'll need an equation, such as $x - 9 = 0$.
2. If you're simplifying or performing an operation, I can help with that as well.

Let me know how you'd like to proceed!

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Would you like to see more details? Here are 5 related questions:

1. What happens if we set $x - 9 = 0$?
2. Can you graph the equation $y = x - 9$?
3. How does the expression change when you add 5 to both sides?
4. What is the solution to $2(x - 9) = 10$?
5. How does factoring apply to this kind of expression?

Tip: When solving simple linear equations, always isolate the variable step by step!