Answer
$21s-15$
Work Step by Step
Add $7s$ and $14s$ to get $21s$
$21s-6-9$
Subtract 9 from -6.
$21s-15$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 10 - Review - Page 726: 2
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