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n-54=4n-21
We move all terms to the left:
n-54-(4n-21)=0
We get rid of parentheses
n-4n+21-54=0
We add all the numbers together, and all the variables
-3n-33=0
We move all terms containing n to the left, all other terms to the right
-3n=33
n=33/-3
n=-11
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