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18(n+4)2=1764
We move all terms to the left:
18(n+4)2-(1764)=0
We multiply parentheses
36n+144-1764=0
We add all the numbers together, and all the variables
36n-1620=0
We move all terms containing n to the left, all other terms to the right
36n=1620
n=1620/36
n=45
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