Example

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

Question

$$=a+b\sqrt{7}; \frac{\sqrt{7}-1}{\sqrt{7}+1}-\frac{\sqrt{7+1}}{\sqrt{2}-1}$$

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