Example

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

Question

$$\frac{x+y}{(x+y)^{2}-z^{2}}+\frac{y-z}{x^{2}-(y-z)^{2}}-\frac{z+x}{(z+x)^{2}-y^{2}}$$

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