1. Let's clarify step 7 in detail. 2. Step 7 involves applying the formula or rule that was introduced earlier in the problem. 3. For example, if step 7 was about solving for $x$ in an equation like $$ax + b = 0$$, the key is to isolate $x$ by subtracting $b$ from both sides and then dividing by $a$. 4. This gives $$x = \frac{-b}{a}$$. 5. Remember, the goal is to perform the same operation on both sides of the equation to maintain equality. 6. If step 7 involved substitution, ensure you replace the variable with the correct expression from previous steps. 7. If it involved simplification, carefully combine like terms or factor expressions as needed. 8. Always double-check each arithmetic operation to avoid mistakes. 9. If you provide the exact problem or step 7's content, I can give a more precise explanation.