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Thanks Todd, but this is not what I want/need. This is what came out (after correcting your formula, supposing that my correction is correct):[mcode]Reduce[{A == (M - N)/M, B == M + N, Z*(M - N)/(1 + Z*M + Z*B) == A*(1/(1/(Z*M) + F3))}, F3] (M == N...