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20=3.75n-25
We move all terms to the left:
20-(3.75n-25)=0
We get rid of parentheses
-3.75n+25+20=0
We add all the numbers together, and all the variables
-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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