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500n-(1500-+200n)=9900
We move all terms to the left:
500n-(1500-+200n)-(9900)=0
We add all the numbers together, and all the variables
500n-(+200n)-9900=0
We get rid of parentheses
500n-200n-9900=0
We add all the numbers together, and all the variables
300n-9900=0
We move all terms containing n to the left, all other terms to the right
300n=9900
n=9900/300
n=33
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