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2n+(3n+1)+2(3n+2)=147
We move all terms to the left:
2n+(3n+1)+2(3n+2)-(147)=0
We multiply parentheses
2n+(3n+1)+6n+4-147=0
We get rid of parentheses
2n+3n+6n+1+4-147=0
We add all the numbers together, and all the variables
11n-142=0
We move all terms containing n to the left, all other terms to the right
11n=142
n=142/11
n=12+10/11
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