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4.5=1.5nn
We move all terms to the left:
4.5-(1.5nn)=0
We add all the numbers together, and all the variables
-(+1.5nn)+4.5=0
We get rid of parentheses
-1.5nn+4.5=0
We move all terms containing n to the left, all other terms to the right
-1.5nn=-4.5
n=-4.5/1
n=-4.5
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