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400=m/2000
We move all terms to the left:
400-(m/2000)=0
We add all the numbers together, and all the variables
-(+m/2000)+400=0
We get rid of parentheses
-m/2000+400=0
We multiply all the terms by the denominator
-m+400*2000=0
We add all the numbers together, and all the variables
-1m+800000=0
We move all terms containing m to the left, all other terms to the right
-m=-800000
m=-800000/-1
m=+800000
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