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Early20Rager
(5m+2)-9m

5m and 9m are like terms, so you can subtract them

5m - 9m + 2

-4m + 2 is the answer
AnimeBrainly
5m + 2 - 9m

5m - 9m = 4m

4m + 2 

4m + 2 is your answer

if you are trying to solve for m
4m + 2
4m = -2
4m/4 = -2/4

m = -1/2

hope this helps