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If $f(x)=\frac{ax+b}{cx+d}, abcd\not=0$ and $f(f(x))=x$ for all $x$ in the domain of $f$, what is the value $a+d$?

 May 3, 2021
 #1
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a + d = -1.

 May 3, 2021
 #2
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0

The answer was 0 but thanks. 

 May 3, 2021

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