$$81 \frac { 963 } { x 57 }$$
$\frac{78003}{x_{57}}$
$$\frac{81\times 963}{x_{57}}$$
$$\frac{78003}{x_{57}}$$
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$-\frac{78003}{x_{57}^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}x_{57}}(\frac{81\times 963}{x_{57}})$$
$$\frac{\mathrm{d}}{\mathrm{d}x_{57}}(\frac{78003}{x_{57}})$$
$$-78003x_{57}^{-1-1}$$
$$-78003x_{57}^{-2}$$