What I want is to obtain a solution for just 7 unknowns, all the other "variables" are fixed, either assumed or taken from the periodic table. For the purposes of calculation in Mathematica, the ~30 "variables" should be treated as input constants:
The vector A = {ACu, AFe, AS, AO, ASi } contain the fixed atomic weights from the periodic table, and all the concentrations are input data, except the following 3 ones: Oe, Sie and Fee.
What I want is a a general solution so I can copy it to an EXCEL worksheet (after symplifying the resulting expressions, of course). There I could put as input the values of the element concentrations and the other parameters.
Regards,
Alberto
