The expression $-(3x - 9)$ can be simplified by distributing the negative sign:

$-(3x - 9) = -1 \cdot (3x - 9) = -3x + 9$

So, the simplified form of the expression is:

$-3x + 9$

Would you like further explanation or have any questions?

Here are 5 related questions to explore this concept:

1. How do you simplify $-(2x - 7)$?
2. What happens if you have $-(-4x + 8)$?
3. How do you factor the expression $3x - 9$?
4. Can you solve the equation $-(3x - 9) = 0$?
5. What happens if you multiply $-(3x - 9)$ by 2?

Tip: Always distribute negative signs carefully when simplifying expressions to avoid mistakes.