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4.5=0.4n
We move all terms to the left:
4.5-(0.4n)=0
We add all the numbers together, and all the variables
-(+0.4n)+4.5=0
We get rid of parentheses
-0.4n+4.5=0
We move all terms containing n to the left, all other terms to the right
-0.4n=-4.5
n=-4.5/-0.4
n=11+0.1/0.4
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