$$9 - x 8 - 50$$
$-1$
$$\frac{\mathrm{d}}{\mathrm{d}x_{8}}(-41-x_{8})$$
$$-x_{8}^{1-1}$$
$$-x_{8}^{0}$$
$$-1$$
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$-x_{8}-41$
$$-41-x_{8}$$