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30n-25=20n+5
We move all terms to the left:
30n-25-(20n+5)=0
We get rid of parentheses
30n-20n-5-25=0
We add all the numbers together, and all the variables
10n-30=0
We move all terms containing n to the left, all other terms to the right
10n=30
n=30/10
n=3
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