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20=9+m
We move all terms to the left:
20-(9+m)=0
We add all the numbers together, and all the variables
-(m+9)+20=0
We get rid of parentheses
-m-9+20=0
We add all the numbers together, and all the variables
-1m+11=0
We move all terms containing m to the left, all other terms to the right
-m=-11
m=-11/-1
m=+11
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