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20n-2n-16n+2n-2n=12
We move all terms to the left:
20n-2n-16n+2n-2n-(12)=0
We add all the numbers together, and all the variables
2n-12=0
We move all terms containing n to the left, all other terms to the right
2n=12
n=12/2
n=6
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