The expression you provided is:

$x + 6 + 7x$

To simplify this expression, combine like terms:

$x + 7x + 6 = 8x + 6$

So, the simplified expression is:

$8x + 6$

Would you like more details or have any questions?

Here are 5 related questions to explore:

1. How would you solve $8x + 6 = 0$?
2. What happens if we change the constants in the expression $x + 6 + 7x$?
3. How can you factor $8x + 6$?
4. What if the original expression was $x^2 + 6 + 7x$?
5. How does this expression behave when $x = 1$?

Tip: Always start by combining like terms when simplifying algebraic expressions!