Hi,

Here's a not too complex transformation but my skills stop here...

First, I've made this formula:

[tex]K = \frac{log(0.5)}{log\frac{M - S}{E - S}}[/tex]

Now I transformed it because I want [tex]M[/tex], and [tex]K[/tex] is known:

[tex]=> \frac{log(0.5)}{K} = log\frac{M - S}{E - S}[/tex]

[tex]=> \frac{log(0.5)}{K} = log(M - S) - log(E - S)[/tex]

[tex]=> \frac{log(0.5)}{K} + log(E - S) = log(M - S)[/tex]

So here I am stuck, I don't know how to extract [tex]M[/tex] from [tex]log(M - S)[/tex]

Many thanks to all for your help

Greg