$$3\ ax^{2}\times xa^{3}\times ax^{4}\times a^{2}$$
$3\left(ax\right)^{7}$
$$3a^{4}x^{2}xax^{4}a^{2}$$
$$3a^{5}x^{2}xx^{4}a^{2}$$
$$3a^{7}x^{2}xx^{4}$$
$$3a^{7}x^{3}x^{4}$$
$$3a^{7}x^{7}$$
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$21x^{6}a^{7}$
