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n+65=5n-15
We move all terms to the left:
n+65-(5n-15)=0
We get rid of parentheses
n-5n+15+65=0
We add all the numbers together, and all the variables
-4n+80=0
We move all terms containing n to the left, all other terms to the right
-4n=-80
n=-80/-4
n=+20
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