$$4=5(P+1)$$
$P=-\frac{1}{5}=-0.2$
$$\frac{4}{5}=P+1$$
$$P+1=\frac{4}{5}$$
$$P=\frac{4}{5}-1$$
$$P=\frac{4}{5}-\frac{5}{5}$$
$$P=\frac{4-5}{5}$$
$$P=-\frac{1}{5}$$
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