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-3+m/2=-12
We move all terms to the left:
-3+m/2-(-12)=0
We add all the numbers together, and all the variables
m/2+9=0
We multiply all the terms by the denominator
m+9*2=0
We add all the numbers together, and all the variables
m+18=0
We move all terms containing m to the left, all other terms to the right
m=-18
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