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2m+21=11m-60
We move all terms to the left:
2m+21-(11m-60)=0
We get rid of parentheses
2m-11m+60+21=0
We add all the numbers together, and all the variables
-9m+81=0
We move all terms containing m to the left, all other terms to the right
-9m=-81
m=-81/-9
m=+9
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