$$54 { a }^{ 4 } { x }^{ 3 } { Y }^{ 2 } -36 { a }^{ 2 } { x }^{ 3 } { y }^{ 3 } +63a { x }^{ 2 } { y }^{ 3 } =$$
$9ax^{2}\left(7y^{3}+6xY^{2}a^{3}-4axy^{3}\right)$
$$9\left(6a^{4}x^{3}Y^{2}-4a^{2}x^{3}y^{3}+7ax^{2}y^{3}\right)$$
$$ax^{2}\left(6a^{3}xY^{2}-4axy^{3}+7y^{3}\right)$$
$$9ax^{2}\left(6a^{3}xY^{2}-4axy^{3}+7y^{3}\right)$$
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