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-2m-4=6m-20
We move all terms to the left:
-2m-4-(6m-20)=0
We get rid of parentheses
-2m-6m+20-4=0
We add all the numbers together, and all the variables
-8m+16=0
We move all terms containing m to the left, all other terms to the right
-8m=-16
m=-16/-8
m=+2
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