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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