$x + x = 2x$

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Here are some related questions you might find useful:

1. What is the value of $3x + 2x$?
2. How do you simplify $4x + 6x$?
3. What happens if you add $x + y + x + y$?
4. How do you solve $2x + 3 = 7$?
5. What is the result of $x - x$?
6. How do you simplify $5x + 2x + x$?
7. What is the value of $x$ in the equation $2x = 10$?
8. How do you combine like terms in the expression $4x + 3y + x$?

Tip: When combining like terms, ensure that you are only adding or subtracting coefficients of the same variable.