3x+9

It looks like you've provided an expression: \( 3x + 9 \). If you need help with it, please let me know what specifically you’d like to do with this expression! Here are a few possibilities:

1. Simplification - This expression is already in its simplest form.
2. Factoring - You can factor out the common factor: \( 3(x + 3) \).
3. Evaluation - You can evaluate this expression for a specific value of \( x \).
4. Solving an equation - If this expression is part of an equation, please provide the equation for solving.

Let me know how you would like to proceed!