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3750=300n-900
We move all terms to the left:
3750-(300n-900)=0
We get rid of parentheses
-300n+900+3750=0
We add all the numbers together, and all the variables
-300n+4650=0
We move all terms containing n to the left, all other terms to the right
-300n=-4650
n=-4650/-300
n=15+1/2
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