Answer
s=-8
Work Step by Step
$s-7=-15$ $\longrightarrow$ addition property
$s-7+7=-15+7$ $\longrightarrow$ simplify
$s=-8$
Substitute to check.
$-8-7=-15$
$-15=-15\checkmark$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
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 - Page 148: 12
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