It seems like your query is incomplete. Are you asking for help with an expression or equation involving $3x$? Could you clarify so I can assist you better?

For example:

• Are you solving for $x$?
• Do you want to simplify or expand an expression?
• Are you dealing with an equation or inequality?

Let me know, and I'll get right to work!

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Here are 5 related examples you might be thinking about:

1. Solve for $x$ in $3x + 2 = 8$.
2. Expand $3x(2x + 5)$.
3. Simplify $\frac{3x}{6}$.
4. Solve the inequality $3x > 9$.
5. Find $x$ if $3x^2 = 12$.

Tip: Always start by identifying the operation in an equation (addition, multiplication, etc.) before solving for the unknown.