1. **State the problem:** Simplify the expression $2x + 3$. 2. **Understand the expression:** This is a linear expression in terms of $x$ with a coefficient of 2 and a constant term 3. 3. **Simplification:** Since the expression is already simplified (no like terms to combine), the expression remains $2x + 3$. 4. **Conclusion:** The simplified form of the expression is $2x + 3$.