To solve the equation \(-3(y + 6) = 21\), the first step is to divide both sides by \(-3\), which simplifies the equation.
Now, the second step is to simplify what you get after dividing. After dividing both sides by \(-3\), you get:
\(y + 6 = -7\).
The next logical step (which would be the second step if you think of it as moving from the original equation to this equation) is to subtract \(6\) from both sides.
Thus, the correct answer for the second step in solving the equation is:
Subtract 6 from both sides.