$$20 { x }^{ 8 } +15 { x }^{ 9 } - { 25 }^{ 10 } =$$
$15x^{9}+20x^{8}-95367431640625$
$$20x^{8}+15x^{9}-95367431640625$$
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$5\left(3x^{9}+4x^{8}-19073486328125\right)$
$$5\left(4x^{8}+3x^{9}-19073486328125\right)$$
