$$x-2 \div { x }^{ 2 } 8$$
$x-\frac{16}{x^{2}}$
$$x-\frac{2\times 8}{x^{2}}$$
$$x-\frac{16}{x^{2}}$$
$$\frac{xx^{2}}{x^{2}}-\frac{16}{x^{2}}$$
$$\frac{xx^{2}-16}{x^{2}}$$
$$\frac{x^{3}-16}{x^{2}}$$
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$\frac{x^{3}-16}{x^{2}}$
