1. **State the problem:** We want to find the sum of $x$ plus $x$.
2. **Use the formula:** When adding like terms, we add their coefficients. Here, both terms are $x$, which is the same as $1 \times x$.
3. **Add the coefficients:** $1 + 1 = 2$.
4. **Write the result:** $x + x = 2x$.
**Final answer:** $2x$
X Plus X
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