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13n+4(n+9)=104
We move all terms to the left:
13n+4(n+9)-(104)=0
We multiply parentheses
13n+4n+36-104=0
We add all the numbers together, and all the variables
17n-68=0
We move all terms containing n to the left, all other terms to the right
17n=68
n=68/17
n=4
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