Answer
$x=43,046,721$
Work Step by Step
$\log_{2}(\log_{3}x)=4\qquad$ ... apply $2^{(..)}$ on both sides
$\log_{3}x=2^{4}$
$\log_{3}x=16\qquad$ ... apply $3^{(..)}$ on both sides
$x=3^{16}$
$x=43,046,721$
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