Chapter 3 - Equations and Problem Solving - Chapter 3 Test - Page 139: 4

$n=-5$

Using the properties of equality, the value of the variable that satisfies the given equation, $ 3n-5=8n+20 ,$ is \begin{array}{l}\require{cancel} 3n-8n=20+5 \\\\ -5n=25 \\\\ n=\dfrac{25}{-5} \\\\ n=-5 .\end{array}