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13n-21=17-3n
We move all terms to the left:
13n-21-(17-3n)=0
We add all the numbers together, and all the variables
13n-(-3n+17)-21=0
We get rid of parentheses
13n+3n-17-21=0
We add all the numbers together, and all the variables
16n-38=0
We move all terms containing n to the left, all other terms to the right
16n=38
n=38/16
n=2+3/8
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