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