To solve for \( n \) in the equation \( 5.6 ( n + 1.42 ) = 7.8 \), the first step would be to distribute \( 5.6 \) on the left side, which gives us:
\[ 5.6n + 5.6 \times 1.42 = 7.8 \]
The second step is to isolate the term containing \( n \). The correct choice for your second step would be:
Subtract \( 5.6 \times 1.42 \) from both sides.
None of the options you provided exactly matches this step, but the closest matching step would be to "Subtract \( 1.42 \) from both sides," if interpreted as isolating \( n \). In solving the equation, subtracting involves working to isolate \( n \) by first simplifying the terms properly.
In summary, after distributing, you'd typically combine terms and isolate \( n \), and the exact step after determining the equation would be to subtract the constant term from both sides.