$$14 { x }^{ 2 } -2xy2x$$
$2\left(7-y_{2}\right)x^{2}$
$$2\left(7x^{2}-xy_{2}x\right)$$
$$x^{2}\left(7-y_{2}\right)$$
$$2x^{2}\left(-y_{2}+7\right)$$
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