Example

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

Question

$$\frac{1}{1+a+a^{2}}+\frac{1}{1+a+a^{-1}}+\frac{1}{1+a^{-1}+a^{-2}}$$

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