It seems like there's a small typo in your expression. Did you mean:

6x + 2x?

If so, here's how we simplify it:

$6x + 2x = (6 + 2)x = 8x$

So the simplified expression is 8x.

Let me know if you need further clarification, or if you'd like to correct the expression!

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Here are some related questions for you:

1. What is the value of $8x$ when $x = 5$?
2. How do you factor the expression $8x$?
3. How would you solve for $x$ if $8x = 40$?
4. What is the derivative of $8x$ with respect to $x$?
5. How would you represent this expression as a linear equation in standard form?

Tip: When combining like terms, make sure the variables are the same in each term (e.g., $6x + 2x$ but not $6x + 2y$).