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7-2m=m+4-4m+7
We move all terms to the left:
7-2m-(m+4-4m+7)=0
We add all the numbers together, and all the variables
-2m-(-3m+11)+7=0
We get rid of parentheses
-2m+3m-11+7=0
We add all the numbers together, and all the variables
m-4=0
We move all terms containing m to the left, all other terms to the right
m=4
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