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6(n+1)+n=4n+9
We move all terms to the left:
6(n+1)+n-(4n+9)=0
We add all the numbers together, and all the variables
n+6(n+1)-(4n+9)=0
We multiply parentheses
n+6n-(4n+9)+6=0
We get rid of parentheses
n+6n-4n-9+6=0
We add all the numbers together, and all the variables
3n-3=0
We move all terms containing n to the left, all other terms to the right
3n=3
n=3/3
n=1
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