Chapter 1 - Expressions, Equations, and Inequalities - 1-6 Absolute Value Equations and Inequalities - Practice and Problem-Solving Exercises - Page 48: 83

$x = \dfrac{d + ab}{c}$ or $x = \dfrac{d – ab}{c}$

$|cx – d| = ab$ means: $cx – d = ab$ or $cx – d = –ab$ Solving for $x$ in each equation we get: $cx – d = ab$ $cx = d + ab$ $x = \dfrac{d + ab}{c}$ or $cx – d = –ab$ $cx = d – ab$ $x = \dfrac{d – ab}{c}$