Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 2 - Section 2.6 - Solving Equations: The Addition and Multiplication Properties - Exercise Set: 11

Answer

d=30

Work Step by Step

$d-9=21$ $\longrightarrow$ addition property $d-9+9=21+9$ $\longrightarrow$ simplify $d=30$ Substitute to check. $30-9=21$ $21=21\checkmark$
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