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3n+6=72+n
We move all terms to the left:
3n+6-(72+n)=0
We add all the numbers together, and all the variables
3n-(n+72)+6=0
We get rid of parentheses
3n-n-72+6=0
We add all the numbers together, and all the variables
2n-66=0
We move all terms containing n to the left, all other terms to the right
2n=66
n=66/2
n=33
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