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4n+18=2n+39
We move all terms to the left:
4n+18-(2n+39)=0
We get rid of parentheses
4n-2n-39+18=0
We add all the numbers together, and all the variables
2n-21=0
We move all terms containing n to the left, all other terms to the right
2n=21
n=21/2
n=10+1/2
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