Chapter 2 - Equations, Inequalities, and Problem Solving - 2.6 Solving Inequalities - 2.6 Exercise Set - Page 135: 84

$n\ge70$

Using the properties of inequality, the solution to the given inequality, $ 0.7n-15+n\ge2n-8-0.4n ,$ is \begin{array}{l}\require{cancel} 1.7n-15\ge1.6n-8 \\\\ 1.7n-1.6n\ge-8+15 \\\\ 0.1n\ge7 \\\\ n\ge\dfrac{7}{0.1} \\\\ n\ge70 .\end{array}