Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5 - Page 34: 59

$3m+29$

Using the Distributive Property and then combining like terms, the given expression, $ -2(m+3)-3(m-1)+8(m+4) ,$ simplifies to \begin{array}{l}\require{cancel} -2m-6-3m+3+8m+32 \\\\= (-2m-3m+8m)+(-6+3+32) \\\\= 3m+29 .\end{array}