The expression is:

$3x - 2x = x$

This is because you combine the like terms. Both terms have the variable $x$, so you subtract the coefficients:

$3 - 2 = 1$

Therefore, the simplified result is:

$x$

Let me know if you need further clarification or any other questions!

Here are some related questions to explore:

1. What happens if we add two like terms, such as $3x + 2x$?
2. How would you simplify the expression $4x - 3x + 5x$?
3. How do you simplify expressions involving exponents like $x^2 - x^2$?
4. What is the distributive property, and how can it simplify expressions like $3(x - 2)$?
5. How do you solve for $x$ in an equation like $3x - 2x = 5$?

Tip: Always combine like terms first when simplifying algebraic expressions for faster solutions.