$$\left. \begin{array} { l } { 6 x y - 12 x y } \\ { a ( b - 5 ) b ( 5 - a ) } \end{array} \right.$$
$6abxy\left(a-5\right)\left(b-5\right)$
$$6abxy\left(a-5\right)\left(b-5\right)$$
$$6xya^{2}b^{2}-30axyb^{2}-30bxya^{2}+150abxy$$
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$-6xy,\ ab\left(5-a\right)\left(b-5\right)$