$$9x9998.6$$
$5.4$
$$\frac{\mathrm{d}}{\mathrm{d}x_{9998}}(5.4x_{9998})$$
$$5.4x_{9998}^{1-1}$$
$$5.4x_{9998}^{0}$$
$$5.4\times 1$$
$$5.4$$
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$\frac{27x_{9998}}{5}$
$$5.4x_{9998}$$