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n/3.1+5=9
We move all terms to the left:
n/3.1+5-(9)=0
We add all the numbers together, and all the variables
n/3.1-4=0
We multiply all the terms by the denominator
n-4*3.1=0
We add all the numbers together, and all the variables
n-12.4=0
We move all terms containing n to the left, all other terms to the right
n=12.4
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