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First factor the each term in the expression.
\5n = 5 · n
\\
10m = 2 · 5 · m
\25 = 5 · 5
\The GCF is the product of the common prime factors in each term.
\GCF = 5
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Write each term as a product of the GCF and its remaining factors.
\5n - 10m + 25 = 5(n) - 5( 2m) + 5(5) \ \
\Combine like terms uisng distribuitve property: ab + ac = a(b + c).
\5n - 10m + 25 = 5(n - 2m + 5)
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Simplified expression is 5(n - 2m + 5) .