Answer
$x = 3$
Work Step by Step
$7(3^{x}) = 189$
$3^{x} = 27$
$3^{x} = 3^{3}$
$x = 3$
Check:
$ 7(3^{x})$
$= 7(3^{3})$
$= 7(27)$
$= 189$
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