Example

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

Question

$$\frac{1}{1+2}\frac{2}{1+2^{2}}+3}{1+2^{3}}+\cdot\cdot\cdot$$

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