Example

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

Question

$$(\frac{x+y}{x-y}-\frac{x-y}{x+y})\cdot\frac{x+y}{x-y}+\frac{x-y}{x+y})^{--1}$$

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