$$-u^{2}x-u^{2}x-u^{2}x-u^{2}x-u^{2}$$
$-\left(4x+1\right)u^{2}$
$$u^{2}\left(-x-x-x-x-1\right)$$
$$-4x-1$$
$$u^{2}\left(-4x-1\right)$$
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