$$2 { x }^{ 2 } +8 { x }^{ 2 } +8x$$
$2x\left(5x+4\right)$
$$2\left(x^{2}+4x^{2}+4x\right)$$
$$x\left(x+4x+4\right)$$
$$5x+4$$
$$2x\left(5x+4\right)$$
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$$10x^{2}+8x$$