Example

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

Question

$$\frac { 1 } { q + 1 } - \frac { q } { q ^ { 2 } - 1 } - \frac { q ^ { 2 } } { 1 - q ^ { 4 } }$$

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