Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$2x^{4}-x^{3}+x^{2}-x-1\ge0$$

Solve for x

$x\in (-\infty,-\frac{1}{2}]\cup [1,\infty)$

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