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27=7n+20
We move all terms to the left:
27-(7n+20)=0
We get rid of parentheses
-7n-20+27=0
We add all the numbers together, and all the variables
-7n+7=0
We move all terms containing n to the left, all other terms to the right
-7n=-7
n=-7/-7
n=1
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