Example

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

Question

$$\frac{(m+n)^{2}}{m^{2}-n^{2}}+\frac{m^{2}+mn}{n^{2}-mn}$$

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