$$4 { P }^{ 2 } -4q+6 { P }^{ 2 } -(5 { P }^{ 2 } -2q)$$
$5P^{2}-2q$
$$10P^{2}-4q-\left(5P^{2}-2q\right)$$
$$10P^{2}-4q-5P^{2}+2q$$
$$5P^{2}-4q+2q$$
$$5P^{2}-2q$$
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