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2 Answers

find the greatest common factor of all the terms
begin with the coefficients: 9, 36, and 39
the GCF is 3
now work with the variables one at a time
find the GCF of m^3, m, and m^4
the GCF is m
find the GCF of n, n^3, and n^2
the GCF is n
the GCF of the algebraic expression is 3mn
factor 3mn from each term of the expression