Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - Chapter 1 Review Problem Set - Page 38: 54

$-2a-4$

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