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3n+6n=16+7
We move all terms to the left:
3n+6n-(16+7)=0
We add all the numbers together, and all the variables
3n+6n-23=0
We add all the numbers together, and all the variables
9n-23=0
We move all terms containing n to the left, all other terms to the right
9n=23
n=23/9
n=2+5/9
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