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-2(m+-3)=12
We move all terms to the left:
-2(m+-3)-(12)=0
We add all the numbers together, and all the variables
-2(m-3)-12=0
We multiply parentheses
-2m+6-12=0
We add all the numbers together, and all the variables
-2m-6=0
We move all terms containing m to the left, all other terms to the right
-2m=6
m=6/-2
m=-3
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