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

$2m-16n$
Using the Distributive Property and then combining like terms, the given expression, $8m-n-3(2m+5n) ,$ simplifies to \begin{array}{l}\require{cancel} 8m-n-6m-15n \\\\= (8m-6m)+(-n-15n) \\\\= 2m-16n .\end{array}