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9=n/3+7
We move all terms to the left:
9-(n/3+7)=0
We get rid of parentheses
-n/3-7+9=0
We multiply all the terms by the denominator
-n-7*3+9*3=0
We add all the numbers together, and all the variables
-1n+6=0
We move all terms containing n to the left, all other terms to the right
-n=-6
n=-6/-1
n=+6
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