$$9 x ^ { 2 } + 6 x + 6 x + 6$$
$9x^{2}+12x+6$
$$9x^{2}+12x+6$$
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$3\left(3x^{2}+4x+2\right)$
$$3\left(3x^{2}+2x+2x+2\right)$$
