$$(3a) \frac{ 3 }{ }$$
$9a$
$$3a\times 3$$
$$9a$$
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$9$
$$\frac{\mathrm{d}}{\mathrm{d}a}(3a\times 3)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(9a)$$
$$9a^{1-1}$$
$$9a^{0}$$
$$9\times 1$$
$$9$$
