$$2Q=6P+2$$
$P=\frac{Q-1}{3}$
$$6P+2=2Q$$
$$6P=2Q-2$$
$$\frac{6P}{6}=\frac{2Q-2}{6}$$
$$P=\frac{2Q-2}{6}$$
$$P=\frac{Q-1}{3}$$
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$Q=3P+1$
$$\frac{2Q}{2}=\frac{6P+2}{2}$$
$$Q=\frac{6P+2}{2}$$
$$Q=3P+1$$
