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Hi all, is here posibility to prevent canceling in Mathematica? I need it to work with transfer and contreller functions (dynamic system theory). I would like to input like this g[s] = s (s + 1)/((s + 1) (s + 2)); and after evaluation get same expression. Another situation is: input: g[s] = s (s + 1)/(s + 2); c[s] =1/(s(s + 1)); l[s] = g[s] c[s] output: l[s] = s(s + 1)/(s(s + 1)(s + 2)) It is possible to get this result? thanks for your answers.