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3(1+6n)=147
We move all terms to the left:
3(1+6n)-(147)=0
We add all the numbers together, and all the variables
3(6n+1)-147=0
We multiply parentheses
18n+3-147=0
We add all the numbers together, and all the variables
18n-144=0
We move all terms containing n to the left, all other terms to the right
18n=144
n=144/18
n=8
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