Answer
The answer is below.
Work Step by Step
The union of two sets includes all values in either set, but repeated values are only listed once. Thus, if we are left with $a$ and $d$, we see that $a$ and $d$ must be equal to $b$ and $c$.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 9 - Inequalities and Problem Solving - 9.2 Intersections, Unions, and Compound Inequalities - 9.2 Exercise Set - Page 591: 99
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