$$2 x ( 6 x - 2 ) - x ( 4 x - 8 )$$
$4x\left(2x+1\right)$
$$12x^{2}-4x-x\left(4x-8\right)$$
$$12x^{2}-4x-\left(4x^{2}-8x\right)$$
$$12x^{2}-4x-4x^{2}-\left(-8x\right)$$
$$12x^{2}-4x-4x^{2}+8x$$
$$8x^{2}-4x+8x$$
$$8x^{2}+4x$$
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$8x^{2}+4x$
