$$(9^{10}:3^{10})^{2}$$
$3486784401$
$$\left(\frac{3486784401}{3^{10}}\right)^{2}$$
$$\left(\frac{3486784401}{59049}\right)^{2}$$
$$59049^{2}$$
$$3486784401$$
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$3^{20}$