1. The problem asks to solve part c from the previous context, but since the previous parts are not provided, I will assume part c involves solving an algebraic expression or equation. 2. To solve any algebraic problem, we use the fundamental rules of algebra such as combining like terms, applying distributive property, and isolating the variable. 3. Without the exact expression or equation for part c, I cannot provide specific steps or a solution. 4. Please provide the exact problem statement or equation for part c so I can assist you accurately.