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If a = (1+x)/(2-x), then what is (1)/(a+...

If `a = (1+x)/(2-x)`, then what is `(1)/(a+1) + (2a+1)/(a^(2)-1)` equal to ?

A

`((1+x)(2+x))/(2x-1)`

B

`((1-x)(2-x))/(x-2)`

C

`((1+x)(2-x))/(2x-1)`

D

`((1-x)(2-x))/(2x+1)`

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