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45=0.2n
We move all terms to the left:
45-(0.2n)=0
We add all the numbers together, and all the variables
-(+0.2n)+45=0
We get rid of parentheses
-0.2n+45=0
We move all terms containing n to the left, all other terms to the right
-0.2n=-45
n=-45/-0.2
n=+225
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