1. The problem asks to solve exercise 3, but since no specific details are given, I will assume it is a typical algebraic equation to solve. 2. The general approach to solving an equation is to isolate the variable on one side using inverse operations. 3. For example, if the equation is $ax + b = 0$, the formula to solve for $x$ is: $$x = -\frac{b}{a}$$ 4. Important rules: - You can add or subtract the same number from both sides. - You can multiply or divide both sides by the same nonzero number. 5. Without the exact equation, I cannot provide intermediate steps or a final answer. 6. Please provide the exact equation or details of exercise 3 for a complete solution.