$$8x-4y-6 { x }^{ 2 } -6xy-2 { y }^{ 2 }$$
$2\left(-3x^{2}-3xy+4x-y^{2}-2y\right)$
$$2\left(4x-2y-3x^{2}-3xy-y^{2}\right)$$
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$-6x^{2}-6xy+8x-2y^{2}-4y$
