1. Let's clarify step 4 by first stating the problem clearly. 2. Identify what step 4 is trying to accomplish in the context of the problem. 3. Review the formula or rule applied in step 4 and explain why it is used. 4. Break down the calculations or transformations done in step 4 into smaller parts. 5. Show intermediate steps with detailed explanations to make the logic clear. 6. Summarize how step 4 fits into solving the overall problem. If you provide the exact problem or step 4 details, I can give a precise explanation.