$$9x^{2}-5x^{3}-4x^{2}-8x^{3}=$$
$\left(5-13x\right)x^{2}$
$$5x^{2}-5x^{3}-8x^{3}$$
$$5x^{2}-13x^{3}$$
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$$x^{2}\left(5-13x\right)$$
$$-13x+5$$
$$x^{2}\left(-13x+5\right)$$
