$$(x^{4}+2x^{2}-5x-x)\div(2x^{2}-1)$$
$\frac{x\left(x^{3}+2x-6\right)}{2x^{2}-1}$
$$\frac{x^{4}+2x^{2}-6x}{2x^{2}-1}$$
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$\frac{x^{4}+2x^{2}-6x}{2x^{2}-1}$
