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(3n+80)=125
We move all terms to the left:
(3n+80)-(125)=0
We get rid of parentheses
3n+80-125=0
We add all the numbers together, and all the variables
3n-45=0
We move all terms containing n to the left, all other terms to the right
3n=45
n=45/3
n=15
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