$$3\cdot93b\div0.32$$
$\frac{6975b}{8}$
$$\frac{279b}{0.32}$$
$$871.875b$$
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$871.875$
$$\frac{\mathrm{d}}{\mathrm{d}b}(\frac{279b}{0.32})$$
$$\frac{\mathrm{d}}{\mathrm{d}b}(871.875b)$$
$$871.875b^{1-1}$$
$$871.875b^{0}$$
$$871.875\times 1$$
$$871.875$$