$$-5p+7 { p }^{ 2 } +9-8 { p }^{ 2 } +15p-9$$
$p\left(10-p\right)$
$$-5p-p^{2}+9+15p-9$$
$$10p-p^{2}+9-9$$
$$10p-p^{2}$$
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$$-p^{2}+10p$$
$$p\left(-p+10\right)$$
