$$\frac{7^{20}\times m^{9}\times7^{11}}{7^{15}\times m^{8}}$$
$33232930569601m$
$$\frac{7^{31}m^{9}}{7^{15}m^{8}}$$
$$7^{16}m$$
$$33232930569601m$$
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$33232930569601$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{7^{31}m^{9}}{7^{15}m^{8}})$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(7^{16}m)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(33232930569601m)$$
$$33232930569601m^{1-1}$$
$$33232930569601m^{0}$$
$$33232930569601\times 1$$
$$33232930569601$$