Example

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

Question

$$\begin{cases}x^{2}-8x-9\ge0\\ \frac{x+2}{x-10}<0\end{cases}$$

Solve for x

$x\in (-2,-1]\cup [9,10)$

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