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(125)n/5=125
We move all terms to the left:
(125)n/5-(125)=0
We multiply all the terms by the denominator
125n-125*5=0
We add all the numbers together, and all the variables
125n-625=0
We move all terms containing n to the left, all other terms to the right
125n=625
n=625/125
n=5
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