1. **State the problem:** Simplify the expressions $-6f + 19 - 8s$ and $-23 + 13f + 12s$. 2. **Identify like terms:** In each expression, terms with the same variables or constants can be combined if needed. Here, each expression is already simplified with no like terms to combine. 3. **Rewrite expressions clearly:** - First expression: $-6f + 19 - 8s$ - Second expression: $-23 + 13f + 12s$ 4. **Explanation:** These are linear expressions in variables $f$ and $s$. They cannot be simplified further without values for $f$ and $s$. 5. **Final answer:** - Expression 1: $-6f + 19 - 8s$ - Expression 2: $-23 + 13f + 12s$