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2m=9m+7
We move all terms to the left:
2m-(9m+7)=0
We get rid of parentheses
2m-9m-7=0
We add all the numbers together, and all the variables
-7m-7=0
We move all terms containing m to the left, all other terms to the right
-7m=7
m=7/-7
m=-1
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