$$- 9 a ^ { 5 } - 6 a ^ { 3 } x ^ { 2 } - 15 a ^ { 2 }$$
$-3a^{2}\left(2ax^{2}+3a^{3}+5\right)$
$$3\left(-3a^{5}-2a^{3}x^{2}-5a^{2}\right)$$
$$a^{2}\left(-3a^{3}-2ax^{2}-5\right)$$
$$3a^{2}\left(-3a^{3}-2ax^{2}-5\right)$$
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