$$15 { a }^{ 2 } bn-45 { a }^{ 2 } nm|10 { a }^{ 2 } { b }^{ 2 } n-30 { a }^{ 2 } { b }^{ 2 } m$$
$15bna^{2}\left(-30bm|n-3m|a^{2}+1\right)$
$$15\left(a^{2}bn-3a^{2}nm|10a^{2}b^{2}n-30a^{2}b^{2}m|\right)$$
$$a^{2}n\left(b-3m|10a^{2}b^{2}n-30a^{2}b^{2}m|\right)$$
$$15a^{2}n\left(b-3m|10a^{2}b^{2}n-30a^{2}b^{2}m|\right)$$
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