To solve for \( n \) in the equation \( 5.6(n + 1.42) = 7.8 \), you should first divide both sides by 5.6 to isolate the expression involving \( n \).
So, the second step would be to divide both sides by 5.6 after first simplifying the equation if needed.
Therefore, the correct response is:
Divide both sides by 5.6.