Example

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

Question

$$\frac { 1 } { 1 + x ^ { a - b } } + \frac { 1 } { 1 + x ^ { b - a } }$$

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