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n/1000=0.123
We move all terms to the left:
n/1000-(0.123)=0
We add all the numbers together, and all the variables
n/1000-0.123=0
We multiply all the terms by the denominator
n-(0.123)*1000=0
We add all the numbers together, and all the variables
n-123=0
We move all terms containing n to the left, all other terms to the right
n=123
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