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12=m/3-3
We move all terms to the left:
12-(m/3-3)=0
We get rid of parentheses
-m/3+3+12=0
We multiply all the terms by the denominator
-m+3*3+12*3=0
We add all the numbers together, and all the variables
-1m+45=0
We move all terms containing m to the left, all other terms to the right
-m=-45
m=-45/-1
m=+45
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