$$9.66 m + 3.18 m$$
$12.84$
$$\frac{\mathrm{d}}{\mathrm{d}m}(12.84m)$$
$$12.84m^{1-1}$$
$$12.84m^{0}$$
$$12.84\times 1$$
$$12.84$$
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$\frac{321m}{25}$
$$12.84m$$