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20=4n-65
We move all terms to the left:
20-(4n-65)=0
We get rid of parentheses
-4n+65+20=0
We add all the numbers together, and all the variables
-4n+85=0
We move all terms containing n to the left, all other terms to the right
-4n=-85
n=-85/-4
n=21+1/4
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