Example

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

Question

$$l+\frac{1}{x\rightarrow\infty}\frac{2^{y}-2^{-y}}{2^{y}+2^{-y}}$$

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