$$8a+2\times6a$$
$20a$
$$8a+12a$$
$$20a$$
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$20$
$$\frac{\mathrm{d}}{\mathrm{d}a}(8a+12a)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(20a)$$
$$20a^{1-1}$$
$$20a^{0}$$
$$20\times 1$$
$$20$$