Example

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

Question

$$\frac { 2 a } { a - 1 } - \frac { a ^ { 2 } + 3 } { a ^ { 2 } - 1 }$$

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