1. The problem is to simplify the expression $n + b$. 2. This is a simple algebraic expression involving the addition of two variables, $n$ and $b$. 3. Since $n$ and $b$ are different variables, they cannot be combined further. 4. Therefore, the simplified form of the expression is simply $n + b$. 5. This expression represents the sum of $n$ and $b$, and no further simplification is possible without knowing the values of $n$ and $b$.