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4(n+3)2=144
We move all terms to the left:
4(n+3)2-(144)=0
We multiply parentheses
8n+24-144=0
We add all the numbers together, and all the variables
8n-120=0
We move all terms containing n to the left, all other terms to the right
8n=120
n=120/8
n=15
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