$$x-3,; 2x^{3}-5x-8x+15$$
$\left(x^{2}-9\right)\left(2x^{2}-6x+5\right)$
$$2x^{3}-13x+15=\left(x+3\right)\left(2x^{2}-6x+5\right)$$
$$\left(x-3\right)\left(x+3\right)\left(2x^{2}-6x+5\right)$$
$$2x^{4}-6x^{3}-13x^{2}+54x-45$$
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$x-3,2x^{3}-13x+15$
