$$7 m m m$$
$7m^{3}$
$$7m^{2}m$$
$$7m^{3}$$
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$21m^{2}$
$$\frac{\mathrm{d}}{\mathrm{d}m}(7m^{2}m)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(7m^{3})$$
$$3\times 7m^{3-1}$$
$$21m^{3-1}$$
$$21m^{2}$$
