Final answer to the problem
$x=5$
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1
Apply the formula: $x^a=y$$\to x^a=pfgg\left(y,x\right)$, where $x^a=y=3^x=243$, $a=x$, $x=3$, $y=243$ and $x^a=3^x$
$3^x=3^{5}$
2
Apply the formula: $a^b=a^c$$\to b=c$, where $a=3$, $b=x$ and $c=5$
$x=5$
Final answer to the problem
$x=5$
