The total physical output $P$ of workers is a function of the number of workers, $x.$ The function $P=f(x)$ is called the physical productivity function. Suppose that the physical productivity of $x$ construction workers is given by

$P=9(2x+9{)}^3-5$

Find the marginal physical productivity, $d\frac{P}{d}x.$

$d\frac{p}{d}x=$

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