The GCF is 5n.
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mn - 15 + 3m - 5n Rearranging: mn + 3m - 5n - 15 = m(n + 3) - 5(n + 3) = (m - 5)*(n + 3)
The GCF is n.
5n-5, because its the 5 time table (called 5n) minus 5 each time
That 5 is the cofficient of the term. The "n" is the variable!
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