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3(3m+1)=12
We move all terms to the left:
3(3m+1)-(12)=0
We multiply parentheses
9m+3-12=0
We add all the numbers together, and all the variables
9m-9=0
We move all terms containing m to the left, all other terms to the right
9m=9
m=9/9
m=1
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