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12+12m=m+3
We move all terms to the left:
12+12m-(m+3)=0
We get rid of parentheses
12m-m-3+12=0
We add all the numbers together, and all the variables
11m+9=0
We move all terms containing m to the left, all other terms to the right
11m=-9
m=-9/11
m=-9/11
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