$$77 x ^ { 2 } y - 33 x y ^ { 2 } - 55 x ^ { 2 } y ^ { 2 }$$
$11xy\left(-5xy+7x-3y\right)$
$$11\left(7x^{2}y-3xy^{2}-5x^{2}y^{2}\right)$$
$$xy\left(7x-3y-5xy\right)$$
$$11xy\left(7x-3y-5xy\right)$$
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