$$7x \times 2x+7x \times 7y-2y \times 7y$$
$14x^{2}+49xy-14y^{2}$
$$7x^{2}\times 2+7x\times 7y-2y\times 7y$$
$$7x^{2}\times 2+7x\times 7y-2y^{2}\times 7$$
$$14x^{2}+7x\times 7y-2y^{2}\times 7$$
$$14x^{2}+49xy-2y^{2}\times 7$$
$$14x^{2}+49xy-14y^{2}$$
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$7\left(2x^{2}+7xy-2y^{2}\right)$
$$7\left(2xx+7xy-2yy\right)$$
