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20=2m-8
We move all terms to the left:
20-(2m-8)=0
We get rid of parentheses
-2m+8+20=0
We add all the numbers together, and all the variables
-2m+28=0
We move all terms containing m to the left, all other terms to the right
-2m=-28
m=-28/-2
m=+14
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