1. Let's start by stating the problem clearly: You want to understand the simplification step at part 7. 2. Simplification in algebra often involves reducing expressions by canceling common factors, combining like terms, or rewriting expressions in simpler forms. 3. The key formula or rule used in simplification is that if you have a fraction \( \frac{a \times c}{b \times c} \), you can cancel the common factor \( c \) to get \( \frac{a}{b} \). 4. For example, if the expression is \( \frac{6x}{3} \), you can write it as \( \frac{\cancel{3} \times 2x}{\cancel{3}} \) and then simplify to \( 2x \). 5. In step 7, look for common factors in numerator and denominator and cancel them using the \( \cancel{...} \) notation to show the cancellation explicitly. 6. After canceling, rewrite the expression without the canceled factors to get the simplified form. 7. This process helps to make expressions easier to work with and understand. If you provide the exact expression from step 7, I can show the detailed simplification with \( \cancel{...} \) steps.