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3m+20=5m-10
We move all terms to the left:
3m+20-(5m-10)=0
We get rid of parentheses
3m-5m+10+20=0
We add all the numbers together, and all the variables
-2m+30=0
We move all terms containing m to the left, all other terms to the right
-2m=-30
m=-30/-2
m=+15
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