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30=6n-n
We move all terms to the left:
30-(6n-n)=0
We add all the numbers together, and all the variables
-(+5n)+30=0
We get rid of parentheses
-5n+30=0
We move all terms containing n to the left, all other terms to the right
-5n=-30
n=-30/-5
n=+6
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