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4-m=4-2m-1
We move all terms to the left:
4-m-(4-2m-1)=0
We add all the numbers together, and all the variables
-m-(-2m+3)+4=0
We add all the numbers together, and all the variables
-1m-(-2m+3)+4=0
We get rid of parentheses
-1m+2m-3+4=0
We add all the numbers together, and all the variables
m+1=0
We move all terms containing m to the left, all other terms to the right
m=-1
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