To simplify the expression $3x + 4x + x$, you combine like terms:

1. Add the coefficients of $x$: $3 + 4 + 1 = 8$.
2. So, $3x + 4x + x = 8x$.

Simplified expression: $8x$

Would you like a detailed breakdown of this solution?

Here are some related questions that expand on this concept:

1. How do you simplify expressions with different variables?
2. What is the general rule for combining like terms?
3. How can this simplification be applied to real-world problems?
4. How does the distributive property relate to simplifying expressions?
5. What are some common mistakes when simplifying algebraic expressions?

Tip: Always look for like terms to combine in algebraic expressions for quicker simplification.