$$12x+9x+2x$$
$23x$
$$21x+2x$$
$$23x$$
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$23$
$$\frac{\mathrm{d}}{\mathrm{d}x}(21x+2x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(23x)$$
$$23x^{1-1}$$
$$23x^{0}$$
$$23\times 1$$
$$23$$