$$(x-1),4x^{3}+3x^{2}-4x+K$$
$\left(x-1\right)\left(4x^{3}+3x^{2}-4x+K\right)$
$$\left(x-1\right)\left(4x^{3}+3x^{2}-4x+K\right)$$
$$4x^{4}-x^{3}-7x^{2}+Kx+4x-K$$
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$x-1,4x^{3}+3x^{2}-4x+K$
