SOLUTION: This one has me in a spin. Simplify: 4m/5n^2-n/2m

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Question 98782: This one has me in a spin.
Simplify:
4m/5n^2-n/2m
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify:
:
4m%2F%285n%5E2%29- n%2F%282m%29
:
The common denominator is 10mn^2:
%28%282m%29%284m%29+-+5n%5E2%28n%29%29%2F%2810mn%5E2%29 = %288m%5E2+-+5n%5E3%29%2F%2810mn%5E2%29; that's about all you can do with it