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30n-25=20n+75
We move all terms to the left:
30n-25-(20n+75)=0
We get rid of parentheses
30n-20n-75-25=0
We add all the numbers together, and all the variables
10n-100=0
We move all terms containing n to the left, all other terms to the right
10n=100
n=100/10
n=10
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