To solve the equation \(-3(y + 6) = 21\), the first step is to divide both sides by \(-3\) to isolate the term \((y + 6)\).
The second step after dividing by \(-3\) would be to simplify the equation. Once divided, the equation becomes:
\[ y + 6 = -7 \]
Now, you would proceed to solve for \(y\).
Therefore, the correct response that identifies the second step in solving the equation is:
Divide both sides by −3.