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6n+3=2n+39
We move all terms to the left:
6n+3-(2n+39)=0
We get rid of parentheses
6n-2n-39+3=0
We add all the numbers together, and all the variables
4n-36=0
We move all terms containing n to the left, all other terms to the right
4n=36
n=36/4
n=9
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