$$7x^{2}+2x; 8x^{3}+4x^{2}+2x$$
$2x\left(7x+2\right)\left(4x^{2}+2x+1\right)$
$$2x\left(7x+2\right)\left(4x^{2}+2x+1\right)$$
$$56x^{4}+44x^{3}+22x^{2}+4x$$
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$x\left(7x+2\right),\ 2x\left(4x^{2}+2x+1\right)$
