You can also go to your local university library, get the book
"Numerical Recipes" (by Press, Teukolsky, Vetterling and Flannery) and
apply the methods and algorithms given in section 9.2 -- "Root finding
in one dimension" -- to the function G defined by

G(x) = F(x) - VALUE.

By the way, it's never bad to go and see what "Numerical Recipes" has to
say about any question related to numerical analysis : their comments
are often both insightfull and enlightening.

Stephane.

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