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-3(m+4)=12
We move all terms to the left:
-3(m+4)-(12)=0
We multiply parentheses
-3m-12-12=0
We add all the numbers together, and all the variables
-3m-24=0
We move all terms containing m to the left, all other terms to the right
-3m=24
m=24/-3
m=-8
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