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3.1+2n=5n
We move all terms to the left:
3.1+2n-(5n)=0
We add all the numbers together, and all the variables
-3n+3.1=0
We move all terms containing n to the left, all other terms to the right
-3n=-3.1
n=-3.1/-3
n=1+0.1/3
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