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curve fitting question


I have data in (x,y) pairs. I have an equation:

  y= a +b (Exp[40*(x + c*y)/d] - 1) - (x +c*y)/e

where a,b,c,d, and e are fitting parameters.

Note that this equationcannot be put in the form y=f(x).

How do I fit this equation to my x,y data?



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