#### Answer

$7$

#### Work Step by Step

Substitute the value of $x$ to have: obtain:
$-x=-(-7) = 7$

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Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$7$

Substitute the value of $x$ to have: obtain:
$-x=-(-7) = 7$

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