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7n+21/7=20
We move all terms to the left:
7n+21/7-(20)=0
determiningTheFunctionDomain 7n-20+21/7=0
We add all the numbers together, and all the variables
7n-17=0
We move all terms containing n to the left, all other terms to the right
7n=17
n=17/7
n=2+3/7
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