Chapter 2 - Equations, Inequalities, and Problem Solving - 2.4 Applications with Percent - 2.4 Exercise Set - Page 111: 89

$\dfrac{1}{3}$

$\bf{\text{Solution Outline:}}$ Multiply the given equation, $ -\dfrac{1}{3} ,$ by $-1$ to get its opposite. $\bf{\text{Solution Details:}}$ Multiplying the given equation by $-1$ to get its opposite results to \begin{array}{l}\require{cancel} -\dfrac{1}{3} \\\\= -1\left( -\dfrac{1}{3} \right) \\\\= \dfrac{1}{3} .\end{array}