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n+n+1+n+2=2n+2+12
We move all terms to the left:
n+n+1+n+2-(2n+2+12)=0
We add all the numbers together, and all the variables
n+n+n-(2n+14)+1+2=0
We add all the numbers together, and all the variables
3n-(2n+14)+3=0
We get rid of parentheses
3n-2n-14+3=0
We add all the numbers together, and all the variables
n-11=0
We move all terms containing n to the left, all other terms to the right
n=11
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