Example

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

Question

$$\frac{ 1- { b }^{ -1 } + { b }^{ -2 } }{ 1-b+ { b }^{ 2 } }$$

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