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-4m=9-m
We move all terms to the left:
-4m-(9-m)=0
We add all the numbers together, and all the variables
-4m-(-1m+9)=0
We get rid of parentheses
-4m+1m-9=0
We add all the numbers together, and all the variables
-3m-9=0
We move all terms containing m to the left, all other terms to the right
-3m=9
m=9/-3
m=-3
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