$$P+(-10)+(-2)+(-6)$$
$P-18$
$$P-12-6$$
$$P-18$$
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$1$
$$\frac{\mathrm{d}}{\mathrm{d}P}(P-12-6)$$
$$\frac{\mathrm{d}}{\mathrm{d}P}(P-18)$$
$$P^{1-1}$$
$$P^{0}$$
$$1$$