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45=3.75n
We move all terms to the left:
45-(3.75n)=0
We add all the numbers together, and all the variables
-(+3.75n)+45=0
We get rid of parentheses
-3.75n+45=0
We move all terms containing n to the left, all other terms to the right
-3.75n=-45
n=-45/-3.75
n=+12
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