Example

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

Question

$$\frac{ m+n }{ m-n } - \frac{ { m }^{ 2 } + { n }^{ 2 } }{ { m }^{ 2 } - { n }^{ 2 } }$$

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