$$3Pqr+6Pqt+3Pqs$$
$3Pq\left(r+s+2t\right)$
$$3\left(Pqr+2Pqt+Pqs\right)$$
$$Pq\left(r+2t+s\right)$$
$$3Pq\left(r+s+2t\right)$$
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