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25.9-3.4n=2.1
We move all terms to the left:
25.9-3.4n-(2.1)=0
We add all the numbers together, and all the variables
-3.4n+23.8=0
We move all terms containing n to the left, all other terms to the right
-3.4n=-23.8
n=-23.8/-3.4
n=+7
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