Example

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

Question

$$\frac { x } { x + y } - \frac { x y } { x ^ { 2 } + 2 x y + y ^ { 2 } }$$

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