Chapter 5 - Exponents and Polynomials - 5.1 - Addition and Subtraction of Polynomials - Problem Set 5.1 - Page 195: 54

$3x-12$

By using the distributive property, removing the grouping symbols, and then combining like terms, the given expression, $ (-3x+6)+(-x-8)-(-7x+10) ,$ simplifies to \begin{array}{l}\require{cancel} -3x+6-x-8+7x-10 \\\\= (-3x-x+7x)+(6-8-10) \\\\= 3x-12 .\end{array}