The expression $2x + 5x$ can be simplified by combining like terms. Both terms have the variable $x$, so you can add the coefficients:

$2x + 5x = (2 + 5)x = 7x$

So, the simplified expression is $7x$.

Would you like more details or have any questions?

Here are five related questions to consider:

1. How would you simplify $3x + 4x + 2x$?
2. What happens if the expression is $2x - 5x$?
3. How do you factor the expression $7x$?
4. What is the value of $7x$ when $x = 3$?
5. How would you express $2x + 5x + 3y$ with different variables?

Tip: When simplifying algebraic expressions, always look for like terms to combine them efficiently.