Example

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

Question

$$x y , \frac { 2 - \sqrt { 5 } } { 2 + 3 \sqrt { 5 } } = x + y \sqrt { 5 }$$

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