$$\Sigma_{i}; \frac{11+x}{x^{3}}+2x(5-x); -x; a^{2}$$
$-2x^{2}+10x+\frac{1}{x^{2}}+\frac{11}{x^{3}}$
$$\frac{11+x}{x^{3}}+10x-2x^{2}$$
$$\frac{11+x}{x^{3}}+\frac{\left(10x-2x^{2}\right)x^{3}}{x^{3}}$$
$$\frac{11+x+\left(10x-2x^{2}\right)x^{3}}{x^{3}}$$
$$\frac{11+x+10x^{4}-2x^{5}}{x^{3}}$$
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