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2000=400n-7200
We move all terms to the left:
2000-(400n-7200)=0
We get rid of parentheses
-400n+7200+2000=0
We add all the numbers together, and all the variables
-400n+9200=0
We move all terms containing n to the left, all other terms to the right
-400n=-9200
n=-9200/-400
n=+23
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