Answer
$2x^2+\frac{-x^2+x+1}{2x^3-1}$
Work Step by Step
We use the long division as be shown in the figure below.
Checking:
$$
(2x^3-1)(2x^2)-x^2+x+1\\
=4x^5-2x^2-x^2+x+1\\
=4x^5-3x^2+x+1
$$

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