$$7P^{2}-19^{2}-6$$
$7P^{2}-367$
$$7P^{2}-361-6$$
$$7P^{2}-367$$
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$14P$
$$\frac{\mathrm{d}}{\mathrm{d}P}(7P^{2}-361-6)$$
$$\frac{\mathrm{d}}{\mathrm{d}P}(7P^{2}-367)$$
$$2\times 7P^{2-1}$$
$$14P^{2-1}$$
$$14P^{1}$$
$$14P$$
