If y= f(x)=ax+b/cx+d , find d such that x = (fof)(x)

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f(x)=ax+b/cx+d , find d such that x = (fof)(x)

If f(x)=ax+b/cx+d then (fof)(x)=x
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U teach very well, but I can't understand what u r writing :( but it's ok thanks bro

GiuliaWhiteMarques