Solve the Expression: Simplifying x + x Using Like Terms

To solve this algebraic problem, follow these steps:

• Step 1: Identify the coefficients of the variable $x$ in the expression $x + x$. Here, the coefficient for each $x$ is 1.
• Step 2: Add the coefficients together. This gives $1 + 1 = 2$.
• Step 3: Multiply the result by the variable. This results in $2x$.

Since the problem is a multiple-choice question, review the available choices to select the correct answer. The expression simplifies to $2x$, which corresponds to choice 3: $2x$.

Therefore, the solution to the problem is $2x$.