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Solving simultaneous integral equation


Hello

I have a problem of the form

Integrate[f[s],{s,(b-e)/c,(b+e)/c]

I am trying to solve for c and e (b is known).
f[s] cannot be integrated algebraicly, only by by setting values for e and c and using NIntegrate. 

I also have a supplimentary equation linking b and c, which cannot be inverted using solve to give a relationship between e and c.

I am trying to use NSolve or FindRoot to solve the system of equations, but I keep getting errors saying that algebraic limits are invalid for NIntegrate. 

Any help or advice would be greatly appreciated.

Thanks

Mat


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