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21+9m=2m+-7
We move all terms to the left:
21+9m-(2m+-7)=0
We add all the numbers together, and all the variables
9m-(2m-7)+21=0
We get rid of parentheses
9m-2m+7+21=0
We add all the numbers together, and all the variables
7m+28=0
We move all terms containing m to the left, all other terms to the right
7m=-28
m=-28/7
m=-4
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