Example

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

Question

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

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