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-2m=4m+18
We move all terms to the left:
-2m-(4m+18)=0
We get rid of parentheses
-2m-4m-18=0
We add all the numbers together, and all the variables
-6m-18=0
We move all terms containing m to the left, all other terms to the right
-6m=18
m=18/-6
m=-3
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