Example

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

Question

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

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