The expression "16) x - 9" seems to represent either a subtraction operation involving $x$ and 9, or it might indicate the 16th item in a sequence. I'll assume it's the expression $x - 9$ unless you provide additional context.

If you're looking for solutions or insights related to this, the expression $x - 9$ is a linear one, and you can rearrange or solve it based on additional information.

For example:

• If you have an equation like $x - 9 = 0$, you can solve for $x$ as follows:

$x - 9 = 0 \quad \Rightarrow \quad x = 9$

Would you like to clarify if there's a specific context or next step?

Here are 5 questions related to algebraic manipulation:

1. What happens when you add 9 to both sides of $x - 9 = y$?
2. How would you solve $x - 9 = 5$?
3. Can you graph the function $f(x) = x - 9$? What is its slope and y-intercept?
4. What is the inverse of the function $f(x) = x - 9$?
5. How do you solve inequalities like $x - 9 \geq 0$?

Tip: To isolate a variable in an equation, perform the same operation on both sides of the equation.