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-9+2m=4m+9
We move all terms to the left:
-9+2m-(4m+9)=0
We get rid of parentheses
2m-4m-9-9=0
We add all the numbers together, and all the variables
-2m-18=0
We move all terms containing m to the left, all other terms to the right
-2m=18
m=18/-2
m=-9
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