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137.80+115.68n-115.68=484.84
We move all terms to the left:
137.80+115.68n-115.68-(484.84)=0
We add all the numbers together, and all the variables
115.68n-462.72=0
We move all terms containing n to the left, all other terms to the right
115.68n=462.72
n=462.72/115.68
n=4
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