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6n-30=3n+
We move all terms to the left:
6n-30-(3n+)=0
We add all the numbers together, and all the variables
6n-(+3n)-30=0
We get rid of parentheses
6n-3n-30=0
We add all the numbers together, and all the variables
3n-30=0
We move all terms containing n to the left, all other terms to the right
3n=30
n=30/3
n=10
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