$$\frac { - 9 } { x } \times \frac { - 9 } { x } \times \frac { - 9 } { x } \times \frac { - 9 } { x }$$
$\frac{6561}{x^{4}}$
$$\left(\frac{-9}{x}\right)^{2}\times \frac{-9}{x}\times \frac{-9}{x}$$
$$\left(\frac{-9}{x}\right)^{3}\times \frac{-9}{x}$$
$$\left(\frac{-9}{x}\right)^{4}$$
$$\frac{\left(-9\right)^{4}}{x^{4}}$$
$$\frac{6561}{x^{4}}$$
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$-\frac{26244}{x^{5}}$
