$$4 x ^ { 2 } - 2 x ^ { 2 } - 2 x$$
$2x\left(x-1\right)$
$$2\left(2x^{2}-x^{2}-x\right)$$
$$x\left(2x-x-1\right)$$
$$x-1$$
$$2x\left(x-1\right)$$
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$$2x^{2}-2x$$
