$$7x+6x-30+0$$
$13x-30$
$$13x-30+0$$
$$13x-30$$
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$13$
$$\frac{\mathrm{d}}{\mathrm{d}x}(13x-30+0)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(13x-30)$$
$$13x^{1-1}$$
$$13x^{0}$$
$$13\times 1$$
$$13$$