$$- \frac{ { x }^{ 3 } }{ x }$$
$-2x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-x^{2})$$
$$2\left(-1\right)x^{2-1}$$
$$-2x^{2-1}$$
$$-2x^{1}$$
$$-2x$$
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$-x^{2}$