$$4=5(P-2)$$
$P = \frac{14}{5} = 2\frac{4}{5} = 2.8$
$$\frac{4}{5}=P-2$$
$$P-2=\frac{4}{5}$$
$$P=\frac{4}{5}+2$$
$$P=\frac{4}{5}+\frac{10}{5}$$
$$P=\frac{4+10}{5}$$
$$P=\frac{14}{5}$$
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