Example

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

Question

$$\frac { \sqrt { 3 } - 1 } { 1 - \sqrt { 3 } - \sqrt { 5 } + \sqrt { 15 } }$$

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