Answer
$x-(-18)$ or $x+18$
Work Step by Step
A number decreased by -18 is the same as adding 18 to the number. So either $x-(-18)$ or $x+18$ is valid.
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 2 - Section 2.4 - Integrated Review - Integers - Page 133: 39
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