$$2p^{2}r^{2}s+8p^{5}r^{7}-4p^{9}$$
$2p^{2}\left(sr^{2}+4p^{3}r^{7}-2p^{7}\right)$
$$2\left(p^{2}r^{2}s+4p^{5}r^{7}-2p^{9}\right)$$
$$p^{2}\left(r^{2}s+4p^{3}r^{7}-2p^{7}\right)$$
$$2p^{2}\left(r^{2}s+4p^{3}r^{7}-2p^{7}\right)$$
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$2s\left(pr\right)^{2}+8p^{5}r^{7}-4p^{9}$
