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-7m+21=-28m+14
We move all terms to the left:
-7m+21-(-28m+14)=0
We get rid of parentheses
-7m+28m-14+21=0
We add all the numbers together, and all the variables
21m+7=0
We move all terms containing m to the left, all other terms to the right
21m=-7
m=-7/21
m=-1/3
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