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10n-(4n+9)=11+2n
We move all terms to the left:
10n-(4n+9)-(11+2n)=0
We add all the numbers together, and all the variables
10n-(4n+9)-(2n+11)=0
We get rid of parentheses
10n-4n-2n-9-11=0
We add all the numbers together, and all the variables
4n-20=0
We move all terms containing n to the left, all other terms to the right
4n=20
n=20/4
n=5
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