How to implement this formula in excel

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Wednesday March 5, 2014
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March 5, 2014
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The formula is

x= [(A-B)-(C-D)/log((A-B)/(C-D))]

It is a iteration
where value of A,B,C are taken from excel cells
the value of D=1 to 200

the iteration should stop when x is approx equal to 0

friends do pls help