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3n+6=51-2n
We move all terms to the left:
3n+6-(51-2n)=0
We add all the numbers together, and all the variables
3n-(-2n+51)+6=0
We get rid of parentheses
3n+2n-51+6=0
We add all the numbers together, and all the variables
5n-45=0
We move all terms containing n to the left, all other terms to the right
5n=45
n=45/5
n=9
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