Example

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

Question

$$\frac{3a+1}{9a^{2}+3a+1}+\frac{3a-1}{9a^{2}-3a+1}-\frac{2}{81a^{4}+9a^{2}+1}$$

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