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104=9n-4
We move all terms to the left:
104-(9n-4)=0
We get rid of parentheses
-9n+4+104=0
We add all the numbers together, and all the variables
-9n+108=0
We move all terms containing n to the left, all other terms to the right
-9n=-108
n=-108/-9
n=+12
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