Chapter 2 - Equations, Inequalities, and Problem Solving - 2.1 Solving Equations - 2.1 Exercise Set - Page 87: 84

$x=-\dfrac{17}{35}$

Using properties of equality, the solution to the given equation, $ \dfrac{17}{35}=-x $, is \begin{array}{l}\require{cancel} -1\left(\dfrac{17}{35}\right)=-x(-1) \\\\ -\dfrac{17}{35}=x \\\\ x=-\dfrac{17}{35} .\end{array}