Example

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

Question

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

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