1. The problem is to solve exercise n1, but since no specific details are given, let's assume it is a basic algebraic problem. 2. Typically, such exercises involve solving equations or simplifying expressions. 3. For example, if the problem is to solve $ax + b = 0$, the formula used is $x = -\frac{b}{a}$. 4. Important rules: $a \neq 0$ to avoid division by zero. 5. If you provide the exact problem statement, I can give detailed steps and solutions.