#### Answer

$4x-1$

#### Work Step by Step

RECALL:
$a^m=a^n \longrightarrow m=n$
Thus, if the formula above is use in the given equation,
$4x-1=7$
Therefore the missing expression in the given statement is:
$4x-1$

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Published by
Pearson

ISBN 10:
0-13417-894-7

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

$4x-1$

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