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2m+20=3m+12
We move all terms to the left:
2m+20-(3m+12)=0
We get rid of parentheses
2m-3m-12+20=0
We add all the numbers together, and all the variables
-1m+8=0
We move all terms containing m to the left, all other terms to the right
-m=-8
m=-8/-1
m=+8
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