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Default Using linest or logest for non-linear equations

I need to find four coeffecients for the equation y=a-b*exp(-c*x^d). I have
the x and y values but want to smooth the data. I've been trying to fit a
non-linear trend to the equation using the power and log trends but since my
equation differs I cannot get them to work. Do you know any way to find
these coefficients?
 
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