$$x x ( x ^ { 2 } - \frac { 1 } { x } ) ^ { 9 }$$
$\frac{\left(x^{3}-1\right)^{9}}{x^{7}}$
$x^{20}-9x^{17}+36x^{14}-84x^{11}+126x^{8}-126x^{5}+84x^{2}-\frac{36}{x}+\frac{9}{x^{4}}-\frac{1}{x^{7}}$
