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Let f : R - {(alpha )/(6) } to R be defi...

Let `f : R - {(alpha )/(6) } to R` be defined by `f (x) = ( 3x + 3)/(6x - alpha).` Then the value of `alpha` for which (fof) `(x) = x ,` for all `x in R -{(alpha)/(6)},` is :

A

6

B

8

C

5

D

No such `alpha` exists

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