$$(7x-2y)(2x+7y)$$
$14x^{2}+45xy-14y^{2}$
$$14x^{2}+49xy-4yx-14y^{2}$$
$$14x^{2}+45xy-14y^{2}$$
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$\left(7x-2y\right)\left(2x+7y\right)$
