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21=6m-27
We move all terms to the left:
21-(6m-27)=0
We get rid of parentheses
-6m+27+21=0
We add all the numbers together, and all the variables
-6m+48=0
We move all terms containing m to the left, all other terms to the right
-6m=-48
m=-48/-6
m=+8
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