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Let f (x) = (ax+b)/(cx+d), where a,b,c d...

Let `f (x) = (ax+b)/(cx+d),` where a,b,c d are non zero If `f (7) =7,f (11)=11 and f(f (x))=x ` for all x except `-d/c.` The unique number which is not is the range of f is

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