Chapter 3 - Equations and Problem Solving - 3.3 - More on Solving Equations and Problem Solving - Problem Set 3.3 - Page 114: 18

$y=-\dfrac{8}{3}$

Using the properties of equality and combining like terms, the value of the variable that satisfies the given equation, $ 8y+4=5y-4 ,$ is \begin{array}{l}\require{cancel} 8y-5y=-4-4 \\\\ 3y=-8 \\\\ y=\dfrac{-8}{3} \\\\ y=-\dfrac{8}{3} .\end{array}