Example

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

Question

$$\frac{x-y}{x^{2}-xy+y^{2}}+\frac{x+y}{x^{2}+xy+y^{2}}-\frac{2y^{3}}{x^{4}+x^{2}y^{2}+y^{4}}$$

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