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

$n=-9$

Using the properties of equality, the value of the variable that satisfies the given equation, $ 4n+3=2n-15 ,$ is \begin{array}{l}\require{cancel} 4n-2n=-15-3 \\\\ 2n=-18 \\\\ n=-\dfrac{18}{2} \\\\ n=-9 .\end{array}