$$10x20 \times 1555$$
$15550$
$$\frac{\mathrm{d}}{\mathrm{d}x_{20}}(15550x_{20})$$
$$15550x_{20}^{1-1}$$
$$15550x_{20}^{0}$$
$$15550\times 1$$
$$15550$$
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$15550x_{20}$
$$15550x_{20}$$