$${(3x^{7})}^{3}$$
$27x^{21}$
$$\left(3x^{7}\right)^{3}$$
$$3^{3}\left(x^{7}\right)^{3}$$
$$27\left(x^{7}\right)^{3}$$
$$27x^{7\times 3}$$
$$27x^{21}$$
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