Answer
$x=-15$
Work Step by Step
Using the properties of equality, the value of the variable that satisfies the given equation, $
-x=15
,$ is
\begin{array}{l}\require{cancel}
(-1)\cdot(-x)=(15)\cdot(-1)
\\\\
x=-15
.\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 3 - Equations and Problem Solving - 3.1 - Solving First-Degree Equations - Problem Set 3.1 - Page 100: 43
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