Chapter 3 - Equations and Problem Solving - 3.2 - Equations and Problem Solving - Problem Set 3.2 - Page 106: 28

$x=14$

Using the properties of equality, the value of the variable that satisfies the given equation, $ 18-3x=-24 ,$ is \begin{array}{l}\require{cancel} -3x=-24-18 \\\\ -3x=-42 \\\\ x=\dfrac{-42}{-3} \\\\ x=14 .\end{array}