Why wolfram alpha doesn't solve this equation ?

Questions
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1

Hello,

solve (1/2 g ((-1+f) erf((c-x)/(sqrt(2) b))-f erf((r-x)/(sqrt(2) d)))) = y for x

doesn’t work … It’s just printing me an empty page !

Any idea ?

2

Is there some reason you expect a closed form solution to such an equation? I’d be surprised at least a little if there is one.