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How to replace a group of symbols to another symbol?

Posted 11 years ago
Hi,
I'm beginner in Mathematica and apologize in advance if my question is foolish.

I have an expression:
1 + f/F - (f S)/F^2

and need to replace f/F->m, and to have in the end
1 + m - m*S/F

What should I do?
(1 + f/F - (f S)/F^2) /. f -> F m
POSTED BY: Felix Zvyagin
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