I could not include the file, I am typing here. If some confusion about understanding the equations, please ask me. "n", "ni" and "j" are suffixes. ----------Problem----------- An+Rni * B = Kni/Tni for all "n" and "i" ---------------------------------------------(1) Sum over n (An)+Rj *B = [Sum over n (Knj)]/Bj for all "j"------------------------(2) Sum over i (Tni)+sum over j (tj) =T for all "n"--------------------------------------(3) Sum over n and sum over i (Tni * Rni)+sum over j (Tj*Rj)= C ------------------(4) From these equations, I have to solve for unknowns "Tni" and "Tj" in terms of knowns Rni, Rj, Kni, Knj, T and C. Condition is: the solution for "Tni" should be independent of "An" , "B" and "Tj". Similarly, solution for "Tj" should be independent of of "An" , "B" and "Tni". -------------Problem ends------------- Please somebody help me!