$$5x-4by2x^{2}+7x+8$$
$4\left(3x-by_{2}x^{2}+2\right)$
$$12x-4by_{2}x^{2}+8$$
$$4\left(3x-by_{2}x^{2}+2\right)$$
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$12x-4by_{2}x^{2}+8$
