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64=5n+9
We move all terms to the left:
64-(5n+9)=0
We get rid of parentheses
-5n-9+64=0
We add all the numbers together, and all the variables
-5n+55=0
We move all terms containing n to the left, all other terms to the right
-5n=-55
n=-55/-5
n=+11
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