Answer
$x=e$.
Work Step by Step
Using the tables: $e □ d=c$, thus $x △(e □ d)=x △ c=b$.
Now using the tables again, the number for $b=a△b=b△a=c△e=d△d=e△c$
Hence $x=e$.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.5 Real Numbers and Their Properties; Clock Addition - Exercise Set 5.5 - Page 309: 65
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