Answer
$-18$
Work Step by Step
Substituting $
x=-3
,$ the given expression, $
(x-6)-(x+12)
,$ evaluates to
\begin{array}{l}\require{cancel}
(-3-6)-(-3+12)
\\\\=
-9-9
\\\\=
-18
.\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5 - Page 34: 69
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