The correct response is:
Multiplying both sides by 7 undoes the division of x by 7 in the original problem.
This is because in the original equation \( \frac{x}{7} - 4 = -6 \), the term \( \frac{x}{7} \) indicates that \( x \) is being divided by 7. To isolate \( x \), multiplying both sides by 7 is a necessary step to effectively eliminate the division.