$$-7x^{2}y+49x^{2}y^{2}-35xy^{2}=$$
$7xy\left(7xy-x-5y\right)$
$$7\left(-x^{2}y+7x^{2}y^{2}-5xy^{2}\right)$$
$$xy\left(-x+7xy-5y\right)$$
$$7xy\left(-x+7xy-5y\right)$$
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