$$a \cdot 3 + \frac { 2 x } { x }$$
$3$
$$\frac{\mathrm{d}}{\mathrm{d}a}(a\times 3+2)$$
$$3a^{1-1}$$
$$3a^{0}$$
$$3\times 1$$
$$3$$
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$3a+2$
$$a\times 3+2$$
