Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$n=\dfrac{4}{5}$
By combining like terms and by using the properties of equality, the solution to the given equation, $7n=2n+4$, is \begin{array}{l}\require{cancel} 7n-2n=4 \\\\ 5n=4 \\\\ n=\dfrac{4}{5} .\end{array}