$$(\frac{3}{7})^{2}\times(\frac{3}{7})^{7}\times(\frac{7}{3})^{9}$$
$1$
$$\left(\frac{3}{7}\right)^{9}\times \left(\frac{7}{3}\right)^{9}$$
$$\frac{19683}{40353607}\times \left(\frac{7}{3}\right)^{9}$$
$$\frac{19683}{40353607}\times \frac{40353607}{19683}$$
$$1$$
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