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