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6m=3m+21
We move all terms to the left:
6m-(3m+21)=0
We get rid of parentheses
6m-3m-21=0
We add all the numbers together, and all the variables
3m-21=0
We move all terms containing m to the left, all other terms to the right
3m=21
m=21/3
m=7
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