Solve (x^4 - 1)(x^3 - 1)/x >= 0 in the real numbers

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a<sup>2</sup> - b<sup>2</sup> = (a - b)(a + b)
a<sup>3</sup> - b<sup>3</sup> = (a - b)(a<sup>2</sup> + ab + b<sup>2</sup>)
 
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